May 2024 Holidays

May 2024 Monthly Holidays

 

Adopt A Horse Month
ALS Awareness Month  Link
(Amyotrophic Lateral Sclerosis or Lou Gehrig's Disease) 
American Cheese Month  Link (Moved from October in  2019)
America's Wetlands Month  Link
Apraxia Awareness Month   Link
APS Month Link
Aramanth Month Link
Asian American & Pacific Islander Heritage Month
Asthma Awareness Month
Awareness of Medical Orphans Month
Better Hearing & Speech Month Link
Better Sleep Month Link
Bladder Cancer Awareness Month  Link
Borderline Personality Disorder Month Link
Brain Tumor Awareness Month Link
Building Safety Month Link Link
Celiac Awareness Month Link
Chip Your Pet Month Link  Link
Clap 4 Health Month
Clean Air Month
Creative Beginnings Month
Cystic Fibrosis Awareness Month Link
Drum Month
EDS (Ehlers-Danlos Syndrome) Awareness Month Link
Family Reunion Month  (Between Mother's Day and Father's Day)
Family Wellness Month
Fibromyalgia Education and Awareness Month
Food Allergy Action Month
Freedom Shrine Month Link
Gardening for Wildlife Month
Get Caught Reading Month
Gifts From The Garden Month
Global Civility Awareness Month
Global Employee Health and Fitness Month
Global Health and Fitness Month Link
Global Youth Traffic Safety Month
Go Fetch! Food Drive for Homeless Animals Month 
Haitian Heritage Month
Heal the Children Month
Healthy Vision Month
Home Schooling Awareness Month
Huntington's Disease Awareness Month
International Audit Month Link
International Business Image Improvement Month
International Civility Awareness Month
International Mediterranean Diet Month
International Victorious Woman Month
Jewish-American Heritage Month
Latino Books Month
Lupus Awareness Month Link
Melanoma/Skin Cancer Detection & Prevention Month
Mental Health Month
Military Appreciation Month Link
Motorcycle Safety Awareness Month Link
Mystery Month
National Allergy/Asthma Awareness Month Link
National Arthritis Awareness Month
National Barbeque Month
National Better Hearing Month Link
National Bike Month Link
National Brain Tumor Awareness Month Link
National Chamber Music Month Link
National Child Passenger Safety Technician Month
National Electrical Safety Month  Link
National Foster Care Month Link
National Good Car Keeping Month
National Hamburger Month  Link  Link
National Hepatitis Awareness Month
National High Blood Pressure Education Month  Link
National Inventors Month Link
Neurofibromatosis Awareness Month (aka NF Month) Link
(World) Lyme Disease Awareness Month Link
National Meditation Month
National Mediterranean Diet Month Link
National Mental Health Month
National Military Appreciation Month
National Pet Cancer Awareness Month Link  Link   (Also in November Different Sponsor)
National Osteoporosis Awareness & Prevention Month
National Photo Month
National Physical Fitness & Sports Month
National Physiotherapy Month Link
National Preservation Month
National Read To Your Baby Bump Month
National Recommitment Month  Link
National Salad Month
National Salsa Month (The Sauce)
National Service Dog Eye Examination Month  Link 
National Smile Month Link  (May 15-June 15)
National Strawberry Month
National Stroke Awareness Month
National Sweet Vidalia Onions Month
National Syringomyelia Awareness Month  Link  
National Tuberous Sclerosis Month Link
National Water Safety Month Link
National Vinegar Month
National Youth Traffic Safety Month Link
Necrotizing Fasciitis Awareness Month
Neurofibromatosis Awareness Month Link
Older Americans Month
Pediatric Feeding Disorder Awareness Month  Link
Personal History Month Link
Pet Cancer Awareness Month Link
Prader-Willi Syndrome Awareness Month
Preeclampsia Awareness Month Link
Prepare Tomorrow's Parents Month (5/11-6/15)
React Month
Revise Your Work Schedule Month
Save Your Tooth Month
Social Security Education Awareness Month
Skin Cancer Awareness Month  Link
Spiritual Literacy Month
Strike Out Strokes Month
Sturge-Weber Awareness Month Link
Teen CEO Month
Tennis Month
Tay-Sachs and Canavan Diseases Month
Textile Month  Link
Tourettes Syndrome Awareness Month (5/15 - 6/15) Link
Toxic Encephalopathy and Chemical Injury Awareness Month Link
Trauma Awareness Month
Ultra-violet Awareness Month
Women's Health Care Month
Worldwide Home Schooling Awareness Month
Young Achievers of Tomorrow Month
National Family Month (5/12 to 6/16) 

May 2024 Weekly Holidays

International Mariachi Week: 1-5  Link
*National Hug Holiday Week: 1-7
*(World) Dystonia Awareness Week: 3-11 Link
Toad Suck Daze: 4-5 (First Weekend)
Air Quality Awareness Week: 5-11 Link  (First M-F)
Be Kind To Animals Week:  5-11 (First Full Week)
Dating and Life Coach Recognition Week: 5-11 Link (First Full Week)
Dog Anxiety Awareness Week: 5-11 (First Full Week)
Drinking Water Week:  5-11  Link (First Full Week)
Flexible Work Arrangement Week:  5-11  (First Full Week)
Goodwill Industries Week: 5-11  (First Full Week)
Geek Week: 5-11  Link  (First Week)
International Clitoris Awareness Week:  5-11 (First Full Week)
National Alcohol & Drug Related Birth Defects Awareness Week:  5-11   (First Full Week)
National Anxiety & Depression Awareness Week:  5-11 (First Full Week)
National Correctional Officer's Week:  5-11  (First Full Week) Link
National Family Week:  5-11  (First Full Week)
National Hug Holiday Week:  5-11
National Pet Week:  5-11  Link  (First Full Week)
National Root Canal Appreciation Week:  5-11 Link (Always Has 10th in it)
National Safety Stand Down Week (Constuction Falls): 5-11 Link
National Sun Awareness Week:  5-11 Link
National Tourism Week:  5-11 Link  (First Full Week)
National WildflowerWeek:  5-11 (First Full Week Sun-Sat)
North American Occupational Safety & Health Week:  5-11(First Full Week)  Link
Peripheral Neuropathy Awareness Week:   5-11 Link
Public Service Recognition Week:  5-11   (First Full Week) Link
Screen-Free Week (Digital Detox Week) : 5-11 Link 
Spring Astronomy Week: 5-11  (Always has Spring Astronomy Day 5/7)
Update Your References Week:  5-11  (First Full Week)
Children's Book Week: 6-10 (First full week starting Monday)  Link  (Also Nov. 3-9)
Construction Safety Week: 6-10 Link
Economic Development Week: 6-10  Link
International Coaching Week: 6-10 Lin
*National Nurses Day and Week: 6-12 Link  Link
*National School Nurse Week: 6-12
PTA Teacher Appreciation Week: 6-10 (First Full M-F Week)
Teacher Appreciation Week: 6-10 (First Full Week M-F)
*Universal Family Week: 10-16 
National Public Gardens Week: 11-18  Link
Westminster Dog Show: 11-14  Link
Display Week: 12-17 Link
Food Allergy Awareness Week: 12-18 Link
Healthcare Documentation Integrity Week: 12-28 Link
National Hospital Week: 12-18 Link
National Nursing Home Week: 12-18 (Starts Mother's Day to Saturday)
National Police Week: 12-18 (Has 15th in it)
National Return To Work Week:  12-18  (2nd Full Week)
National Stuttering Awareness Week: 12-18 (Second full Week)
National Tick Awareness Week: 12-18 (Seond Week)
National Transportation Week: 12-18 (Always Includes the 3rd Friday)
National Women's Health Week:12-18 (2nd Full Week)
Reading is Fundamental Week:  12-18  Link  (2nd Full Week)
Salute to Moms 40+ Week:  12-18 (Starts on Mothers Day)
Salvation Army Week:  12-18  (Second Week)
Work At Home Moms Week:  12-18  (Starts on Mother's Day)
Hoarding Awareness Week: 13-17 Link
National Etiquette Week: 13-17  (Begins 2nd Monday of Full Week)
National Stationery Week: 13-19  Link
PGA Championships: 13-19
Teacher Appreciation Week: 13-17 (M-F of First Full Week)
Cannes Film Festival: 14-25
*National Foul Ball Week: 16-21
EMS Week: 19-25 (3rd Full Week)
Healthy and Safe Swimming Week: 19-25 (Week before Memorial Day M-S) Link
International Heritage Breeds Week: 19-25 Link  (3rd Full Week)
International New Friends, Old Friends Week: 19-25 (3rd Week)
National Backyard Games Week: 19-25  (Week before Memorial Day)
National Eosinophil Awareness Week: 19-25  Link  (Third Week)
National Medical Transcription Week: 19-25 Link (3rd Full Week)
National Safe Boating Week: 19-25 (Week before Memorial Day)
National Unicycle Week: 19-25  (Begins on 3rd Sunday)
PGA Championship: 19-25  Link
World Schizophrenia Awareness Week: 19-25 Link (Has 24th in it)
World Trade Week: 19-25  (3rd Week)
American Craft Beer Week: 20-25 Link  (Begins 3rd Monday of Full Week)
National Bike to Work Week: 20-24 Link  (3rd Week M-F) 
National Seat Belt Reinforcement Week: 20-6/1  Link
Craft Brewers Week: 21-24 Link
Fleet Week: 22-28
Mule Days: 22-27  Link
Mudbug Madness Days:  24-27   (Memorial Day Weekend)  
National Polka Weekend: 24-26  Link (Always Memorial Day Weekend)
*Week of Solidarity With The People of Non-Self-Governing Territories: 25-31
Old-Time Player Piano Weekend:  26-28 (Always Memorial Day Weekend)  Link
National Marina Days: 27-9/2 (From Memorial Day to Labor Day)  Link
*Black Single Parents Week: 28-6/3 
Scripps Spelling Bee Finals: 28-30 (Tues.-Thurs. after Memorial Day)

May 2024 Daily Holidays

*Amtrak Day: 1
*Batman Day: 1 (Also in September)
*Beltane: 1 Link
*CSS Reboot Day: 1
*Discuss Your Wage Day: 1
*Executive Coaching Day: 1
*Global Love Day: 1 Link
Great American Grump Out: 1 (First Wednesday)
*Hug Your Cat Day: 1 (No website. Sponsor Marisa D'Vari, NY)
*International Doodle Dog Day: 1 Link
*International Guerilla Sunflower Gardening Day: 1 Link
*International Workers Day: 1  Link  Link
*Keep Kids Alive! Drive 25 Day: 1
*Law Day: 1
*Lei Day: 1
*Loyalty Day: 1
*May Day: 1
*May One Day: 1
*Mother Goose Day: 1
National Anxiety Disorders Screening Day: 1 (First Wednesday)
*National Bubba Day: 1
National Day to Prevent Teen & Unplanned Pregnancy: 1 Link (First Wednesday)
National (Deaf) Interpreter Day: 1 Link   (First Wednesday)
*National Heatstroke Prevention Day: 1
*National High Potassium Awareness Day: 1
*National Purebred Dog Day: 1 Link
National Skilled Trades Day: 1 Link (First Wednesday)
*New Homeowner's Day: 1
Project ACES Day: 1 (First Wednesday)
*Religious Brothers Day: 1 Link
*School Principals' Day: 1
*Silver Star Banner Day: 1 Link
*Skyscraper Day: 1
*Stepmother's Day: 1


*International Harry Potter Day: 2
*Life Insurance Day: 2  Link
National Day of Prayer: 2 (First Thursday) Link
National Day of Reason: 2 (First Thursday)
*Roberts Rule of Order Day: 2
*Scurvy Awareness Day: 2
*U.S. Capitol Police Day: 2
World Password Day: 2 Link (First Thursday)
*World Tuna Day: 2

 

Dandelion Day: 3-5  Link
*Garden Meditation Day: 3
International Sauvignon Blanc Day: 3 Link (First Friday)
*Lumpy Rug Day: 3
National Bike and Roll To School Day: 3
*National Special-abled Pets Day: 3 
*National Two Different Colored Shoes Day: 3
*Paranormal Day: 3
*Public Radio Day: 3
*SAN (Storage Area Network) Architect Day: 3 Link
School Lunch Hero Day: 3 Link (First Friday)
Space Day: 3 Link (First Friday)
*Sun Day: 3  Link
Tuba Day: 3  (First Friday) Link
*Wild Koala Day: 3  Link
*World Press Freedom Day: 3
*World Textile Day: 3 Link

 

Bladder Cancer Awareness Day: 4 Link (First Saturday)
Bombshell's Day: 4  (First Saturday) (Victoria's Secret)
Free Comic Book Day: 4 Link   (First Saturday)
Herb Day: 4 Link (First Saturday) 
*Intergalactic Star Wars Day: 4 (May the Fourth Be With You!) Link
International Doodle Dog Day: 4  (First Saturday)
*International Firefighters Day: 4 Link  Link
*International Respect for Chickens Day: 4  Link
Join Hands Day: 4 Link (First Saturday)
Kentucky Derby: 4 (First Saturday)
Learn To Ride A Bike Day: 4 (First Saturday)
Mariachi Day: 4  (First Saturday)
National Auctioneers Day: 4 (First Saturday)
*National Business Broker's Day: 4
National Fallen Firefighters Memorial Day: 4-6  Link 
National Fitness Day:  4 (First Saturday)
National Homebrew Day: 4 Link  (First Saturday)
National Play Outside Day:  4 Link (First Saturday)
National Scrapbooking Day:  4  (First Saturday) Link
National Wildfire Community Preparedness Day: 4 Link  (First Saturday)
*National Self-Employed Day: 4 Link
*National Weather Observers Day: 4 Link
*Petite and Proud Day: 4
Start Seeing Monarchs Day:  4 Link (First Saturday)
*World Give Day: 4
World Naked Gardening Day:  4 Link (First Saturday)

*African World Hertitage Day: 5
*Cartoonists Day: 5
*Chanel No. 5 Day: 5
*Childhood Stroke Awareness Day: 5 Link
*Cinco de Mayo: 5 Link
International Bereaved Mothers' Day: 5 (First Sunday) Link
*International Day of The Midwife: 5 Link
*International Roller Derby Day: 5
Lemonade Day: 5  Link  (First Sunday)
National Infertility Survival Day: 5 (Sunday before Mother's Day)
Motorcycle Mass & Blessing of The Bikes Day: 5 (First Sunday)
*Missing or Murdered Indigenous Persons Awareness Day: 5 Link 
*National Astronaut Day: 5 Link
*Revenge of the Fifth (Star Wars Sith): 5 Link
Rogation Sunday or Rural Life Sunday: 5  (5th Sunday After Easter)
Rural Life Sunday: 5 (First Sunday)
*Silence The Shame Day: 5  Link
*Totally Chipotle Day: 5
*World Asthma Day: 5
World Laughter Day: 5 Link  Link  (First Sunday)
*World Portuguese Language Day: 5

 

Great Lakes Awareness Day: 6 (Monday of first full week)
International Female Ride Day: 6 Link
*International Management Accounting Day: 6
*Joseph Brackett Day: 6
Melanoma Monday: 6 (First Monday)
*No Diet Day: 6
*No Homework Day: 6 Link
*Nurses Day or National RN Recognition Day: 6  Link Link
*Russel Stover Candies Day: 6



*Beaufort Scale (Wind) Day: 7
Childhood Depression Awareness Day: 7 (First Tuesday)
*Cosmopolitan Day: 7 (Drink)
*Cystinosis Awareness Day: 7
Foster Care Day: 7 Link  (First Tuesday)
*International Sauvignon Blanc Day: 7  Link  (Note: Different than on on April 27)
*National Barrier Awareness Day: 7
*National Design Packaging Day: 7 Link
National Teacher Day: 7 (First Tuesday of the First Full Week)
Poem on Your Pillow Day: 7 (First Tuesday)
*Spring Astronomy Day: 7
World Asthma Day: 7 (First Tuesday)
*Worldwide Day of Genital Autonomy: 7  Link

 

Bike and Roll To School Day: 8
Donate A Day's Wages To Charity: 8 (Second Wednesday)
*Free Trade Day: 8
*International Thalassaemia Day: 8 Link
*National Animal Disaster Preparedness Day: 8 Link
*National Cruelty Free Day: 8
National Night Shift Workers Day: 8 (Second Wednesday)
National Third Shift Workers Day: 8  (Second Wednesday)
*No Socks Day: 8 Link
Receptionists Day: 8  (Second Wednesday)
*Time of Remembrance & Reconciliation for Those Who Lost Their Lives During The Second World War: 8-9
School Nurse Day: 8 Link  (Always the Wednesday of School Nurse Week 6-12)
*Student Nurse Day: 8  Link
*V E Day: 8
*World Ovarian Cancer Day: 8 Link
*World Red Cross / Red Crescent Day: 8

 

*Alphabet Magnet Day: 9  Link
*Europe Day: 9 Link
*Home Front Heroes Day: 9 Link
*National Moscato Day: 9
National Children's Mental Health Awareness Day: 9 (Thursday of First Full Week)
*National Sleepover Day: 9 Link

Child Care Provider Day: 10 Link  (Friday before Mother's Day)
*Clean Your Room Day: 10 Link
*Dia De La Madre: 10
Fintastic Friday: Giving Sharks A Voice: 10  (2nd Friday)
*Hostess Cupcake Day: 10 Link
*International Day of Argania:  10
Martin Z. Mollusk Day: 10 Link  (First Friday of first full week)
Military Spouse Appreciation Day: 10 Link  (Friday before Mother's Day)
*National Hampster Day: 10 Link
*National Lipid Day: 10 (Dyslipidemia)  Note: Different than one on Sept. 24)
National Public Gardens Day: 10 Link  (Friday Before Mother's Day)
National Provider Appreciation Day: 10 Link (Friday before Mother's Day)
O. Henry Pun-off Day: 10? Link
*Root Canal Appreciation Day: 10
*World Lupus Day: 10

 

American Indian Day: 11 Link (2nd Saturday)
Bereaved Mother's Day: 11 (2nd Saturday)
Birthmother's Day (Saturday before Mother's Day): 11 Link
Cornelia de Lange Syndrome Awareness Day: 11 Link (2nd Saturday)
*Eat What You Want Day: 11 Link
Indigenous Arts Day: 11
International Migratory Bird Day: 11 (2nd Saturday)  Link (Also in October)
Letter Carrier's  Stamp Out Hunger Food Drive Day: 11 Link  (2nd Saturday)
Mother Ocean Day: 11 (Saturday Before Mother's Day)
National Archery Day: 11  Link  (Second Saturday)
National Babysitters Day: 11 (Saturday before Mother's Day)
National Dog Mom's Day: 11 (Saturday before Mother's Day)
*National Foam Rolling Day: 11 Link (Massage)
National Golf Day: 11 Link (Second Monday)
National Miniature Golf Day: 11 (2nd Saturday)
National Train Day: 11 (Saturday closest to the 10th.)
National Women's Check-up Day: 11 Link (Second Monday)
National Windmill Day: 11 (2nd Saturday)
Stay Up All Night: 11 (2nd Saturday)
World Belly Dance Day: 11 (2nd Saturday)
World Fair Trade Day: 11 (2nd Saturday)
World Migratory Bird Day: 11 (2nd Saturday)
*Root Canal Appreciation Day: 11 

*International Awareness Day for Chronic Immunological and Neurological Diseases: 12  Link
*International Day of Plant Health: 12
*International Nurses Day: 12 Link   Link
*Limerick Day: 12
*ME/CFS InternatiMother's Day: 12 Link  Link
Mother's Day: 12
Mother's At The Wall Day: 12 (Always Mother's Day)
Root Canal Awareness Day: 12 Link
*National Nutty Fudge Day: 12 Link
*National Saphire Segulah Day: 12 Link
*Native American Rights Day: 12
*Odometer Day: 12



*Children of Fallen Patriots Day: 13
*Crouton Day: 13
*Frog Jumping Day: 13
*Hummus Day: 13  Link
*Indigenous Arts Day: 13
*National Crouton Day: 13 Link
*World Cocktail Day: 13  Link

*Apraxia Awareness Day: 14 Link
*National Chicken Dance Day: 14 Link
*National Decency Day: 14 Link Link
*The Stars and Stripes Forever Day: 14
*Underground America Day: 14
*WAAC Day: 14

Buddha Day: 15 Link  (Celebration Date) Note: Historical date is always April 8
*Hyperemisis Gravidarum Awareness Day: 15
*International Day of Families: 15
*International Kangaroo Care Awareness Day: 15 Link
*International MPS Awareness Day: 15  Link
*Nakba Day: 15
*National Chocolate Chip Day: 15 Link
National Employee Health & Fitness Day: 15 Link (3rd Wednesday)
National Juice Slush Day: 15 (3rd Wednesday)  Link
*National Peace Officer Memorial Day: 15
*National Slider Day: 15  (Food)
*Nylon Stockings Day: 15
*National Tuberous Sclerosis Day: 15  Link
*Peace Officer Memorial Day: 15 Link  Link
*Straw Hat Day: 15  Link
Turn Beauty Inside Out Day: 15 (3rd Wednesday)
*World Orthodontic Health Day: Link

*Biographer's Day: 16
GAAD Day (Global Accessibility Awareness Day): 16 Link  (3rd Thursday)
*Honor Our LGBT Elders' Day: 16  Link
*International Day of Light: 16  Link
*International Day of Living in Peace: 16  Link
*Mimosa Day: 16 (Drink)
*National BBQ Day: 16 Link
*National Piercing Day: 16
*National Sea Monkey Day: 16

Endangered Species Day: 17 Link  (3rd Friday)
*International Day Against Homophobia, Transphobia and Biphobia: 17  Link
*Graduation Tassel Day: 17 Link
International Defense Transportation Day: 17 (3rd Friday)
International Virtual Assistants Day: 17  (3rd Friday)
Morel Mushroom Day: 17-19 (Weekend After Mother's Day)
NASCAR Day: 17 Link  (3rd Friday) 
National Bike to Work Day: 17 Link   (3rd Friday) 
National Pizza Party Day: 17 (3rd Friday)  Link
*National Walnut Day: 17 Link
*Pinot Grigio Day: 17 Link
*Same Sex Marriage Day: 17
*Syttende Mai: 17
World Eel Day: 17 (3rd Friday)
*World Hypertension Day: 17  Link
*World Telecommunications and Information Society Day: 17  Link
*World Neurofibromatosis Day (NF Day): 17  Link

 

 Armed Forces Day: 18  (3rd Saturday) 
*Buy A Musical Instrument Day: 18 Link  (Honor of The Music Man Creator)
California Strawberry Day: 18 Link (3rd Saturday)
Do Dah Day: 18 Link  (3rd Saturday)
Federal Tech Day: 18 Link
*HIV Vaccine Awareness Day: 18 Link
*I Love Reeses Day: 18 Link  Link
International Learn To Swim Day: 18 (3rd Saturday)
*International Museum Day: 18 Link
Morel Mushrooms Day: 18-19 (Weekend after Mother's Day)
*Mother Whistler Day: 18
*National Speech Pathologist Day: Link
Preakness: 18 (3rd Saturday) 
*Send An Electronic Greeting Card Day: 18 Link
Spring Astronomy Day: 18
*Visit Your Relatives Day: 18
World Fiddle Day: 18 Link (3rd Satuday)

 

*Accounting Day: 19 Link
Bay to Breakers Race: 19 Link  Note: Oldest Footrace in America!  (3rd Sunday in May)
*Boys Club Day: 19
*Hepatitus Testing Day: 19
*May Ray Day: 19
*National Asian & Pacific Islander HIV/AIDS Awareness Day: 19 Link
*National Hepatitus Testing Day: 19
*National Scooter Day: 19
Pentecost: 19 (7th Sunday after Easter)
Note: Also called Rural Life Sunday or Soil Stewardship Sunday
Ride A Unicycle Day: 19 (3rd Sunday)
Rural Life Sunday: 19 (3rd Sunday)
Take Your Parents To The Playground (Park) Day: 19 Link (3rd Sunday)
WhitSunday: 19 (Same as Pentecost)
*World IBD Day: 19 Link

 

*Blue Jeans Day: 20
CSCMP's Supply Chain Professionals Day: 20 (3rd Monday)
Hoarding Awareness Day: 20 Link (3rd Monday)
*Eliza Doolittle Day: 20
*Everybody Draw Mohammed Day: 20 Link
*International Human Resources Day: 20 Link
*International Red Sneakers Day: 20  Link
*National Association of Psychometrist's Day: 20 Link
*National Rescue Dog Day: 20  Link
*National Streaming Day: 20 Link
Supply Chain Professional Day: 20  (3rd Monday)
Victoria Day: 20?  Link
*Weights & Measures Day: 20
*World Autoimmune/Autoinflammatory Arthritis Day (World AiArthritis Day) 20 Link
*World Bee Day: 20 Link

 
*American Red Cross Founder's Day: 21
*End of the World or Rapture Party Day: 21 (Prediction)  Link
*I Need A Patch For That Day: 21 Link
*International Tea Day: 21  Link
*National Memo Day: 21
*National Waitstaff Day: 21
*Sister Maria Hummel Day: 21
*World Chardonnay Day: 21 Link
*World Day for Cultural Diversity for Dialogue & Development: 21

 

*Canadian Immigrants Day: 22
Emergency Medical Services for Children Day: 22 Link (Wednesday of EMS Wk)
*Harvey Milk Day: 22
*International Being You Day: 22 Link
*International Day for Biological Diversity: 22
*National Craft Distillery Day: 22 Link
*National Maritime Day: 22
*NF2 Awareness Day: 22 Link
*Sherlock Holmes Day: 22  Link  Link
*US Colored Troops Day: 22 
*World Goth Day: 22 Link
*World Paloma Day: 22 Link


Day of Vesak: 23 Link  (Traditionally on the Full May Moon)  NOTE: Vesak varies per Buddist country. See the link! 
Declaration of the Bab Day: 23
Eat More Fruits & Vegetables Day: 23 (Thursday before Memorial Day)  Link
*International Day to End Obstetric Fistula: 23
*National Best Friend-in-Law Day: 23
*National Taffy Day: 23 Link
Stop The Bleed Day: 23 Link
*World Turtle Day: 23

 

*Aviation Maintenance Technician Day: 24  Link
*Brother's Day: 24  Link
Don't Fry Day: 24 (Friday Before Memorial Day) Link
EMS Day: 24 Link (Wednesday of EMS Week)
*International Tiara Day: 24
*Morse Code Day: 24 (Some also observe on April 27)
National Cooler Day: 24 (Friday Before Memorial Day) Link
*National and International Missing Children's Day: 24  Link
National Polka Day: 24-26 Link (Always Memorial Day weekend)
National Road Trip Day: 24 (Friday Before Memorial Day Weekend)  Link
National Title Track Day: 24 (4th Friday)
National Wig Out Day: 24 (Always Fri. before Memorial Day)
*Scavenger Hunt and Treasure Hunt Day: 24 Link
*World Schizophrenia Awareness Day: 24 Link
*Yucatan Shrimp Day: 24 Link

 

Amateur Radio Military Appreciation Day (ARMAD): 25 Link  (Saturday of Memorial Day Weekend)
*Cookie Monster's Birthday: 25  Link  (See also November 2)
International Heritage Breeds Day: 25 Link  (Saturday of 3rd Full Week)
*International Plastic Free Day: 25 Link
Julia Pierpont Day: 25  (4th Saturday)
Lag B'Omer: 25
*National Brown Bag-it Day: 25 Link (Note: Paper Bag Day is 7/12)
National Learn To Swim Day: 25  (Saturday of Week Before Memorial Day) Link
*National Missing Childrens Day: 25
*National Tap Dance Day: 25
*National Wine Day: 25 Link
*Nerd Pride Day or Geek Pride Day: 25 Link
*Towel Day: 25 Link
*World Fish Migration Day: 25
*World Thyroid Day: 25  Link

 
Indianapolis 500: 26 (Sunday of Memorial Day Weekend) 
*National Chardonnay Day: 26 Link
*National Paper Airplane Day: 26 Link
Neighbor Day: 26 (Sunday before Memorial Day Weekend)
*World Lindy Hop Day: 26

*Cellophane Tape Day: 27
Hamburger Day: 27 Link (Always Memorial Day)
*Joe Cool Day: 27 Link
Memorial Day: 27 (Observed)
National Marina Day: 27 Link (On Memorial Day)
Prayer for Peace Memorial Day: 27

 
*Amnesty International Founders Day: 28
Ascension of the Baha'U'Llah: 28
*Menstrual Hygiene Day: 28 Link
*National Brisket Day: 28 Link
*National Hamburger Day: 28 Link
*Sierra Club Day: 28 Link
*Slugs Return From Capistrano Day: 28 Link
*U.S. Border Patrol Day: 28
Women's Golf Day: 28-6/4  Link

*Ascension of Baha'U'llah: 29
*International Day of United Nations Peacekeepers: 29
*Learn About Composting Day: 29
*National 529 Day: 29  Link
*National Alligator Day: 29
National Senior Health & Fitness Day: 29 Link  (Last Wednesday)
*Put A Pillow On Your Fridge Day: 29 Link
World Otter Day: 29 (Last Wednesday)

*Indianapolis 500 Anniversary: 30
*Loomis Day: 30
*Memorial Day (Traditional): 30
*Mint Julep Day: 30
*National Creativity Day: 30  Link
*World MS Day (Multiple Sclerosis): 30 Link 

Heat Awareness Day: 31 Link   (Last Friday)
*National Smile Day: 31 (Middle of Smile Month 5/15 - 6/15) Link
*Necrotizing Fasciitis Awareness Day:31  Link
*Save Your Hearing Day: 31 Link Link
*What You Think Upon Grows Day: 31
*World No-Tobacco Day: 31
*World Parrot Day: 31 Link