May 2025 Holidays

May 2025 Monthly Holidays

 

Adopt A Horse Month
ALS Awareness Month  Link
(Amyotrophic Lateral Sclerosis or Lou Gehrig's Disease) 
American Cheese Month  Link
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
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
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
(World) Lyme Disease Awareness Month Link
National Meditation Month
National Mediterranean Diet Month Link
National Mental Health Month
National Military Appreciation Month
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 Stop The Bleed Month  Link
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 (aka NF Month) Link
Older Americans Month
Oncology Nurses Month Link
Pediatric Feeding Disorder Awareness Month  Link
Pediatric Stroke Awareness Month  Link
Personal History 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 2025 Weekly Holidays

*National Hug Holiday Week: 1-7
*(World) Dystonia Awareness Week: 3-11 Link
Spring Astronomy Week: 3-10
Toad Suck Daze: 3-4 (First Weekend)
National Small Business Week: 4-10 Link
Be Kind To Animals Week:  4-10 (First Full Week)
Dating and Life Coach Recognition Week: 4-10 Link (First Full Week)
Dog Anxiety Awareness Week: 4-10 (First Full Week)
Drinking Water Week:  4-10  Link (First Full Week)
Flexible Work Arrangement Week:  4-10  (First Full Week)
Goodwill Industries Week: 4-10  (First Full Week)
Geek Week: 4-10  Link  (First Week)
International Clitoris Awareness Week:  4-10 (First Full Week)
National Alcohol & Drug Related Birth Defects Awareness Week: 4-10 (First Full Week)
National Anxiety & Depression Awareness Week:  4-10 (First Full Week)
National Correctional Officer's Week: 4-10  (First Full Week) Link
National Family Week:  4-10  (First Full Week)
National Pet Week:  4-10  Link  (First Full Week)
National Root Canal Appreciation Week: 4-10 Link (Always Has 10th in it)
National WildflowerWeek: 4-10 (First Full Week Sun-Sat)
Peripheral Neuropathy Awareness Week: 4-10 Link  (First Full Week)
Pet Appreciation Week: 4-10 (First Full Week)   Link Link
Public Service Recognition Week: 4-10 (First Full Week) Link
Screen-Free Week (Digital Detox Week) : 4-10 Link (First Full Week)
Update Your References Week:  4-10  (First Full Week)
Air Quality Awareness Week: 5-9 Link  (First M-F)
Children's Book Week: 5-11 (First full week starting Monday) Link  (Also Nov. 4-10)
Construction Safety Week: 5-9 Link
National Safety Stand Down Week: 5-9 Link
North American Occupational Safety & Health Week: 5-9 (First M-F Week)  Link
PTA Teacher Appreciation Week: 5-9 (First Full M-F Week)
Teacher Appreciation Week: 5-9 (First Full Week M-F)
*National School Nurse Week: 6-12
*National Nurses Day and Week: 6-12 Link  Link
National Public Gardens Week: 9-18 Link (Friday before to the Sunday after Mother’s Day)
*Universal Family Week: 10-16 
Food Allergy Awareness Week: 11-17 (2nd Full Week) Link
International Coaching Week: 11-17 Link
National Hospital Week: 11-17 Link
National Nursing Home Week: 11-17 (Starts Mother's Day to Saturday)
National Police Week: 11-17 (Has 15th in it)
National Return To Work Week:  11-17  (2nd Full Week)
National Skilled Nursing Care Week: 11-17 Link
National Stuttering Awareness Week: 11-17 (Second full Week)
National Tick Awareness Week: 11-17 (Seond Week)
National Transportation Week: 11-17 (Always Includes the 3rd Friday)
National Women's Health Week:11-17 (2nd Full Week)
Reading is Fundamental Week:  11-17 Link  (2nd Full Week)
Salute to Moms 40+ Week: 11-17 (Starts on Mothers Day)
Salvation Army Week: 11-17  (Second Week)
Work At Home Moms Week:  11-17  (Starts on Mother's Day)
American Craft Beer Week: 12-18 Link  (Begins 2nd Monday of Full Week)
Economic Development Week: 12-16  Link
Hoarding Awareness Week: 12-16 (M-F 2nd Week)  Link
National Sun Awareness Week: 12-18 Link
National Bike to Work Week: 12-16 Link  (2nd Week M-F) 
National Etiquette Week: 12-16  (Begins 2nd Monday of Full Week)
National Stationery Week: 12-17  Link
PGA Championships: 12-18 Link
Cannes Film Festival: 13-24
Display Week: 13-15 Link
*National Foul Ball Week: 16-21
International Heritage Breeds Week: 18-24 Link  (3rd Full Week)
Neuroscience Nurses Week: 18-24 Link (3rd Week)
EMS Week: 18-24 (3rd Full Week)  Link  Link Link
Healthcare Documentation Integrity Week: 18-24 Link
Healthy and Safe Swimming Week: 18-24 (Week before Memorial Day M-S) Link
International New Friends, Old Friends Week: 18-24 (3rd Week)
National Backyard Games Week: 18-24  (Week before Memorial Day)
National Eosinophil Awareness Week: 18-24  Link  (Third Week)
National Medical Transcription Week: 18-24 Link (3rd Full Week)
National Safe Boating Week: 18-24 (Week before Memorial Day)
National Tourism Week:  18-24  Link  (3rd Full Week)
National Unicycle Week: 18-24  (Begins on 3rd Sunday)
World Trade Week: 18-24 (3rd Week)
National Marina Days: 19-9/1 (From Memorial Day to Labor Day)  Link
National Seat Belt Reinforcement Week: 19-6/1  Link
Mule Days: 21-26
Mule Days: 21-26  Link
Fleet Week: 23-26
Old-Time Player Piano Weekend:  23-25 Link
Mudbug Madness Days:  23-26   (Memorial Day Weekend)  
National Polka Weekend: 23-25  Link (Always Memorial Day Weekend)
National African Violet Week: 25-6/1
*Week of Solidarity With The People of Non-Self-Governing Territories: 25-31
Scripps Spelling Bee Finals: 27-29 (Tues.-Thurs. after Memorial Day)
*Black Single Parents Week: 28-6/3 
Great American Brass Band Week: 29-31 Link

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
*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 Bubba Day: 1
National Day of Prayer: 1 (First Thursday) Link
National Day of Reason: 1 (First Thursday)
*National Heatstroke Prevention Day: 1
*National High Potassium Awareness Day: 1
*National Purebred Dog Day: 1 Link
*New Homeowner's Day: 1
*Religious Brothers Day: 1 Link
*School Principals' Day: 1
*Silver Star Banner Day: 1 Link
*Skyscraper Day: 1
*Stepmother's Day: 1
World Password Day: 1 Link (First Thursday)


*International Harry Potter Day: 2
International Sauvignon Blanc Day: 2 Link (First Friday)
*Life Insurance Day: 2
Martin Z. Mollusk Day: 2 Link  (First Friday)
*Roberts Rule of Order Day: 2
School Lunch Hero Day: 2 Link (First Friday)
Space Day: 2 Link (First Friday)
*Scurvy Awareness Day: 2
Tuba Day: 2  (First Friday) Link
*U.S. Capitol Police Day: 2
*World Tuna Day: 2

Bladder Cancer Awareness Day: 3 Link (First Saturday)
Bombshell's Day: 3  (First Saturday) (Victoria's Secret)
Dandelion Day: 3-5  Link
Free Comic Book Day: 3 Link  (First Saturday)
*Garden Meditation Day: 3
Herb Day: 3 Link (First Saturday) 
Indigenous Arts Day: 3
International Doodle Dog Day: 3  (First Saturday)
International Female Ride Day: 3 Link (First Saturday)
*International Firefighters Day: 3-4 Link  Link
Join Hands Day: 3 Link (First Saturday)
Kentucky Derby: 3 (First Saturday)
Learn To Ride A Bike Day: 3 (First Saturday)
Mariachi Day: 3  (First Saturday)
National Auctioneers Day: 3 (First Saturday)
*Lumpy Rug Day: 3
National Fitness Day:  3 (First Saturday)
National Homebrew Day: 3 Link  (First Saturday)
National Play Outside Day: 3 Link (First Saturday)
National Scrapbooking Day: 3 (First Saturday) Link
National Wildfire Community Preparedness Day: 3 Link  (First Saturday)
*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
Spring Astronomy Day: 3
Start Seeing Monarchs Day: 3 Link (First Saturday)
*Sun Day: 3  Link
*Wild Koala Day: 3  Link
World Naked Gardening Day: 3 Link (First Saturday)
*World Press Freedom Day: 3
*World Textile Day: 3 Link

 

International Bereaved Mothers' Day: 4 (First Sunday) Link
*Intergalactic Star Wars Day: 4 (May the Fourth Be With You!) Link
*International Respect for Chickens Day: 4  Link
Lemonade Day: 4  Link  (First Sunday)
MayDay for Mutts: 4 Link (First Sunday)
Motorcycle Mass & Blessing of The Bikes Day: 4 (First Sunday)
National Infertility Survival Day: 4 (Sunday before Mother's Day)
*National Business Broker's Day: 4
National Fallen Firefighters Memorial Day: 4-5  Link 
*National Self-Employed Day: 4 Link
*National Weather Observers Day: 4 Link
*Petite and Proud Day: 4
Rural Life Sunday: 4 (First Sunday)
*World Give Day: 4
World Laughter Day: 4 Link  Link  (First Sunday)

*African World Hertitage Day: 5
*Cartoonists Day: 5
*Chanel No. 5 Day: 5
*Childhood Stroke Awareness Day: 5 Link
*Cinco de Mayo: 5 Link
Great Lakes Awareness Day: 5 (Monday of the first week)
*International Day of The Midwife: 5 Link
*International Roller Derby Day: 5
Melanoma Monday: 5 (First Monday)
*Missing or Murdered Indigenous Persons Awareness Day: 5 Link 
*National Astronaut Day: 5 Link
*Revenge of the Fifth (Star Wars Sith): 5 Link
*Silence The Shame Day: 5  Link
*Totally Chipotle Day: 5
*World Asthma Day: 5
*World Portuguese Language Day: 5

 

Childhood Depression Awareness Day:6 (First Tuesday)
Foster Care Day: 6 (First Tuesday)
*International Management Accounting Day: 6
*International Sauvingnon Blanc Day: 6  (Also August 30)
*Joseph Brackett Day: 6
National Teacher Day: 6 (First Tuesday of the First Full Week)
*No Diet Day: 6
*No Homework Day: 6 Link
*Nurses Day or National RN Recognition Day: 6  Link Link
Poem on Your Pillow Day: 6 (First Tuesday)
*Russel Stover Candies Day: 6
World Asthma Day: 6 (First Tuesday)


*Beaufort Scale (Wind) Day: 7
*Cosmopolitan Day: 7 (Drink)
*Cystinosis Awareness Day: 7
Data Innovation Day: 7-8 Link
Great American Grump Out: 7 (First Wednesday)
National Anxiety Disorders Screening Day: 7 (First Wednesday)
*National Barrier Awareness Day: 7
National Bike and Roll To School Day: 7  Link
National Day to Prevent Teen & Unplanned Pregnancy: 7 Link (First Wednesday)
National (Deaf) Interpreter Day: 7 Link   (First Wednesday)
*National Design Packaging Day: 7 Link
National Skilled Trades Day: 7 Link (First Wednesday)
Project ACES Day: 7 (First Wednesday)
School Nurse Day: 7 Link  (Always the Wednesday of School Nurse Week 6-12)
*Spring Astronomy Day: 7
*Worldwide Day of Genital Autonomy: 7  Link

 

 

National Children's Mental Health Awareness Day: 8 (Thursday of First Full Week)
*Free Trade Day: 8
*International Thalassaemia Day: 8 Link
*National Animal Disaster Preparedness Day: 8 Link
*National Cruelty Free Day: 8
National Golf Day: 8-10? Link
*No Socks Day: 8 Link
*Time of Remembrance & Reconciliation for Those Who Lost Their Lives During The Second World War: 8-9
*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
Child Care Provider Day: 9 Link  (Friday before Mother's Day)
*Europe Day: 9 Link
Fintastic Friday: Giving Sharks A Voice: 9 (2nd Friday)
*Home Front Heroes Day: 9 Link
Military Spouse Appreciation Day: 9 Link  (Friday before Mother's Day)
National Public Gardens Day: 9 Link  (Friday Before Mother's Day)
National Provider Appreciation Day: 9 Link (Friday before Mother's Day)
*National Moscato Day: 9
*National Sleepover Day: 9 Link

Bereaved Mother's Day: 10 (2nd Saturday)
Birthmother's Day (Saturday before Mother's Day): 10 Link
*Clean Your Room Day: 10 Link
Cornelia de Lange Syndrome Awareness Day: 10 Link (2nd Saturday)
*Dia De La Madre: 10
*Hostess Cupcake Day: 10 Link
*International Day of Argania:  10
International Migratory Bird Day: 10 (2nd Saturday)  Link (Also in October)
Letter Carrier's  Stamp Out Hunger Food Drive Day: 10 Link  (2nd Saturday)
Mother Ocean Day: 10 (Saturday Before Mother's Day)
National Archery Day: 10  Link  (Second Saturday)
National Babysitters Day: 10 (Saturday before Mother's Day)
National Dog Mom's Day: 10 (Saturday before Mother's Day)
*National Hamster Day: 10 Link
*National Lipid Day: 10 (Dyslipidemia)  Note: Different than one on Sept. 24)
National Miniature Golf Day: 10 (2nd Saturday)
National Train Day: 10 (Saturday closest to the 10th.)
National Windmill Day: 10 (2nd Saturday)
O. Henry Pun-off Day: 10 Link
*Root Canal Appreciation Day: 10
Stay Up All Night: 10 (2nd Saturday)
World Belly Dance Day: 10 (2nd Saturday)
World Fair Trade Day: 10 (2nd Saturday)
World Migratory Bird Day: 10 (2nd Saturday)
*World Lupus Day: 10

 

*Eat What You Want Day: 11 Link
Mother's Day: 11
Mother's At The Wall Day: 11 (Always Mother's Day)
*National Foam Rolling Day: 11 Link (Massage)
*Root Canal Appreciation Day: 11 

 

Buddha Day: 12 Link  (Celebration Date) Note: Historical date is always April 8
Day of Vesak: 12 Link  (Traditionally on the Full May Moon)  NOTE: Vesak varies per Buddist country. See the link! 
*Fibromyalgia Awareness Day: 12 Link
Hoarding Awareness Day: 12 Link (Second Monday)
*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 International Mother's Day: 12 Link Link
*Root Canal Awareness Day: 12
*National Nutty Fudge Day: 12 Link
*National Saphire Segulah Day: 12 Link
National Women's Check-up Day: 12 Link (Second Monday)
*Native American Rights Day: 12
*Odometer Day: 12


*American Indian Day: 13 Link
*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
Donate A Day's Wages To Charity: 14 (Second Wednesday)
*National Chicken Dance Day: 14 Link
*National Decency Day: 14 Link Link
National Night Shift Workers Day: 14 (Second Wednesday)
National Third Shift Workers Day: 14 (Second Wednesday)
Receptionists Day: 14 (Second Wednesday)
*The Stars and Stripes Forever Day: 14
*Underground America Day: 14
*WAAC Day: 14

GAAD Day (Global Accessibility Awareness Day): 15 Link  (3rd Thursday)
*Hyperemisis Gravidarum Awareness Day: 15
*International Day of Families: 15
*International Kangaroo Care Awareness Day: 15 Link
*International MPS Awareness Day: 15  Link
Lag B'Omer: 15
*Nakba Day: 15
*National Chocolate Chip Day: 15 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
*World Orthodontic Health Day: Link

*Biographer's Day: 16
Endangered Species Day: 16 Link  (3rd Friday)
*Honor Our LGBT Elders' Day: 16  Link
*International Day of Light: 16  Link
*International Day of Living in Peace: 16  Link
International Defense Transportation Day: 16 (3rd Friday)
International Virtual Assistants Day: 16 (3rd Friday)
*Mimosa Day: 16 (Drink)
Morel Mushroom Day: 16-18 (Weekend After Mother's Day)
NASCAR Day: 16 Link  (3rd Friday) (Also October 5)
*National BBQ Day: 16 Link
National Bike to Work Day: 16 Link   (3rd Friday) 
National Pizza Party Day: 16 (3rd Friday)  Link
*National Piercing Day: 16
*National Sea Monkey Day: 16
World Eel Day: 16 (3rd Friday)

Armed Forces Day: 17 (3rd Saturday) 
California Strawberry Day: 17 Link (3rd Saturday)
Do Dah Day: 17 Link  (3rd Saturday)
*Graduation Tassel Day: 17 Link
*International Day Against Homophobia, Transphobia and Biphobia: 17  Link
International Heritage Breeds Day: 17 Link  (3rd Saturday)
International Learn To Swim Day: 17 (3rd Saturday)
*National Walnut Day: 17 Link
*Pinot Grigio Day: 17 Link
Preakness: 17 (3rd Saturday) 
*Same Sex Marriage Day: 17
*Syttende Mai: 17
World Fiddle Day: 17 Link (3rd Satuday)
*World Hypertension Day: 17  Link
*World Telecommunications and Information Society Day: 17  Link
*World Neurofibromatosis Day (NF Day): 17  Link

 

Bay to Breakers Race: 18 Link  Note: Oldest Footrace in America!  (3rd Sunday in May)
*Buy A Musical Instrument Day: 18 Link  (Honor of The Music Man Creator)
*Federal Tech Day: 18 Link
*HIV Vaccine Awareness Day: 18 Link
*I Love Reeses Day: 18 Link  Link
*International Museum Day: 18 Link
*Mother Whistler Day: 18
*National Speech Pathologist Day: Link
Neighbor Day: 18 (Sunday before Memorial Day Weekend)
Ride A Unicycle Day: 18 (3rd Sunday)
Rural Life Sunday: 18 (3rd Sunday) Note: Soil Stewardship Sunday
*Send An Electronic Greeting Card Day: 18 Link
Take Your Parents To The Playground (Park) Day: 18 Link (3rd Sunday)
*Visit Your Relatives Day: 18

 

*Accounting Day: 19 Link
*Boys Club Day: 19
CSCMP's Supply Chain Professionals Day: 19 (3rd Monday)
*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
Supply Chain Professional Day: 19 (3rd Monday)
Victoria Day: 19 Link
*World IBD Day: 19 Link

 

*Blue Jeans Day: 20
*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
*Weights & Measures Day: 20
*World Autoimmune/Autoinflammatory Arthritis Day (World AiArthritis Day) 20 Link
*World Bee Day: 20 Link Link Link Link Link  Link

 
*American Red Cross Founder's Day: 21
EMS Day: 21 (Wednesday of EMS Week)   Link
Emergency Medical Services for Children Day: 21 Link (Wednesday of EMS Wk) Link  Link Link
*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 Employee Health & Fitness Day: 21 Link (3rd Wednesday)
National Juice Slush Day: 21 (3rd Wednesday)  Link
*National Memo Day: 21
*National Waitstaff Day: 21
*Sister Maria Hummel Day: 21
Turn Beauty Inside Out Day: 21 (3rd Wednesday)
*World Chardonnay Day: 21 Link
*World Day for Cultural Diversity for Dialogue & Development: 21

 

*Canadian Immigrants Day: 22
Eat More Fruits & Vegetables Day: 22 (Thursday before Memorial Day)  Link
International Chardonnay Day: 22 Link (Thursday before Memorial Day)
*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
*US Colored Troops Day: 22 
*World Goth Day: 22 Link  Link Link
*World Paloma Day: 22 Link



Declaration of the Bab Day: 23
Don't Fry Day: 23 (Friday Before Memorial Day) Link
*International Day to End Obstetric Fistula: 23
*National Best Friend-in-Law Day: 23
National Cooler Day: 23 (Friday Before Memorial Day) Link
National Polka Day: 23-25 Link (Always Memorial Day weekend)
National Road Trip Day: 23 (Friday Before Memorial Day Weekend) 
National Title Track Day: 23 (4th Friday)
National Wig Out Day: 23 (Always Fri. before Memorial Day)
*National Taffy Day: 23 Link
*Stop The Bleed Day: 23 Link
*World Turtle Day: 23

 

Amateur Radio Military Appreciation Day (ARMAD): 24 Link  (Saturday of Memorial Day Weekend)
*Aviation Maintenance Technician Day: 24  Link
*Brother's Day: 24  Link
*International Tiara Day: 24
Julia Pierpont Day: 24 (4th Saturday)
*Morse Code Day: 24 (Some also observe on April 27)
*National and International Missing Children's Day: 24  Link
National Learn To Swim Day: 24  (Saturday of Week Before Memorial Day) Link
*Scavenger Hunt and Treasure Hunt Day: 24 Link
*World Schizophrenia Awareness Day: 24 Link
*Yucatan Shrimp Day: 24 Link

 

*Cookie Monster's Birthday: 25  Link  (See also November 2)
Indianapolis 500: 25 (Sunday of Memorial Day Weekend) 
*International Plastic Free Day: 25 Link
*National Brown Bag-it Day: 25 Link (Note: Paper Bag Day is 7/12)
*National Missing Childrens Day: 25
*National Tap Dance Day: 25
*National Wine Day: 25 Link
*Nerd Pride Day or Geek Pride Day: 25 Link
Rogation Sunday or Rural Life Sunday: 25  (5th Sunday After Easter)
*Towel Day: 25 Link
*World Fish Migration Day: 25
*World Thyroid Day: 25  Link

 
Hamburger Day: 26 Link (Always Memorial Day)
Memorial Day: 26 (Observed)
National Marina Day: 26 - 9/1 Link (Starts on Memorial Day thru Labor Day)
*National Chardonnay Day: 26 Link
*National Paper Airplane Day: 26 Link Link Link Link
Prayer for Peace Memorial Day: 26
*World Lindy Hop Day: 26

*Cellophane Tape Day: 27
*Joe Cool Day: 27 Link
Women's Golf Day: 27-6/3  Link

 
*Amnesty International Founders Day: 28
*Menstrual Hygiene Day: 28 Link
*National Brisket Day: 28 Link
National Senior Health & Fitness Day: 28 Link  (Last Wednesday)
*Sierra Club Day: 28 Link
*Slugs Return From Capistrano Day: 28 Link
*U.S. Border Patrol Day: 28 Link Link
World Otter Day: 28 (Last Wednesday)

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
*Put A Pillow On Your Fridge Day: 29 Link

National Flip Flop Day: 30 (Last Friday) Link 
Heat Awareness Day: 30 Link   (Last Friday)
*Indianapolis 500 Anniversary: 30
*Loomis Day: 30
*Memorial Day (Traditional): 30
*National Creativity Day: 30  Link Link
*World MS Day (Multiple Sclerosis): 30 Link 

*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
*What You Think Upon Grows Day: 31
*World No-Tobacco Day: 31
*World Parrot Day: 31 Link