| Declaration of Independence | |  |
| Bicycle Day | | |
| National Hanging Out Day | | |
| National Oklahoma City Bombing Commemoration Day | | |
| National Garlic Day | | |
| National Amaretto Day | | |
| Landing of the 33 orientals | | |
| Birthday of King Mswati III | | |
| Administrative Professionals Week | | |
| National Rice Ball Day | | |
| Chinese Language Day | | |
| Lima Bean Respect Day | | |
| National Cheddar Fries Day | | |
| National Look Alike Day | | |
| National Pineapple Upside Down Cake Day | | |
| Sechseläuten | | |
| St. George's Day | | |
| Patriot's Day | | |
| Queen's Birthday | | |
| 420 Day | | |
| Tiradentes Day | | |
| San Jacinto Day | | |
| National Kindergarten Day | | |
| National Chocolate Covered Cashews Day | | |
| National Yellow Bat Day | | |
| Queen's Birthday | | |
| Yom HaZikaron (Memorial Day) | | |
| National Tea Day | | |
| National Bulldogs Are Beautiful Day | | |
| World Creativity And Innovation Day | | |
| National Holocaust, World War II Genocide and other Fascist Crimes Victims Remembrance Day | | |
| Oklahoma Day | | |
| National Girl Scout Leader’s Day | | |
| National Jelly Bean Day | | |
| Administrative Professionals Day | | |
| Yom Ha'atzmaut | | |
| Earth Day | | |
| Stephen Lawrence Day | | |
| National Beagle Day | | |
| International Mother Earth Day | | |
| St. George's Day | | |
| World Book and Copyright Day | | |
| English Language Day | | |
| Language Day | | |
| Day of Turks | | |
| German Beer Day | | |
| National Sovereignty and Children's Day | | |
| Lover's Day | | |
| Castile and León Day | | |
| National Talk Like Shakespeare Day | | |
| National Picnic Day | | |
| National Take a Chance Day | | |
| National Cherry Cheesecake Day | | |
| National Lost Dogs Awareness Day | | |
| Take Our Daughters and Sons to Work Day | | |
| Girls' Day - Career Information Day | | |
| First Day of Summer | | |
| Day of Aragón | | |
| Gathering Of Nations | | |
| International Girls In ICT Day | | |
| Spanish Language Day | | |
| World Table Tennis Day | | |
| Love Your Thighs Day | | |
| Action Day for Tolerance and Respect between People | | |
| Genocide Remembrance Day | | |
| Concord Day | | |
| National Pigs in a Blanket Day | | |
| National Hairball Awareness Day | | |
| Arbor Day | | |
| Scream Day | | |
| International Day Of Multilateralism And Diplomacy For Peace | | |
| World Malaria Day | | |
| Liberation Day | | |
| The Feast of St Mark | | |
| Liberty Day | | |
| Sinai Liberation Day | | |
| Chosun People's Army Foundation Day | | |
| National Flag Day | | |
| National Telephone Day | | |
| National East Meets West Day | | |
| National Zucchini Bread Day | | |
| National DNA Day | | |
| National Hug a Plumber Day | | |
| National Rebuilding Day | | |
| National Sense of Smell Day | | |
| National Pool Opening Day | | |
| National Kiss of Hope Day | | |
| Children´s Day | | |
| ANZAC Day | | |
| National Lingerie Day | | |
| World Penguin Day | | |
| World Veterinary Day | | |
| National Go Birding Day | | |
| Independent Bookstore Day | | |
| International Marconi Day | | |
| International Delegate’s Day | | |
| Intellectual Property Day | | |
| World Intellectual Property Day | | |
| Secretaries' Day | | |
| Day of Remembrance of the Chernobyl Tragedy | | |
| Union Day | | |
| National Audubon Day | | |
| National Dissertation Day | | |
| National Richter Scale Day | | |
| National Kids and Pets Day | | |
| National Pretzel Day | | |
| National Help a Horse Day | | |
| National Pet Parents Day | | |
| Confederate Heroes' Day | | |
| International Chernobyl Disaster Remembrance Day | | |
| Birthday of the Sultan of Terengganu | | |
| Turkmen Racing Horse Festival | | |
| Hung Kings Festival | | |
| World Pinhole Photography Day | | |
| Alien Day | | |
| Get Organized Day | | |
| World Burlesque Day | | |
| Hug An Australian Day | | |
| King's Day | | |
| State Flag Day | | |
| Independence Day | | |
| Day of Uprising Against Occupation | | |
| Freedom Day | | |
| National Babe Ruth Day | | |
| National Tell a Story Day | | |
| National Prime Rib Day | | |
| National Devil Dog Day | | |
| Confederate Memorial Day | | |
| Confederate Heroes' Day observed | | |
| ANZAC Day | | |
| ANZAC Day observed | | |
| Morse Code Day | | |
| World Tapir Day | | |
| Marine Mammal Rescue Day | | |
| National Heroes Day | | |
| World Day for Safety and Health at Work | | |
| Afghan Victory Day | | |
| Workers' Memorial Day | | |
| National Superhero Day | | |
| National Blueberry Pie Day | | |
| National Great Poetry Reading Day | | |
| National BraveHearts Day | | |
| St. Pierre Chanel Day | | |
| Save The Frogs Day | | |
| School Bus Drivers Day | | |
| Biological Clock Day | | |
| National Cubicle Day | | |
| Global Pay It Forward Day | | |
| Clean Comedy Day | | |
| Day of Trees | | |
| International Dance Day | | |
| National Peace Rose Day | | |
| National Zipper Day | | |
| National Shrimp Scampi Day | | |
| Shōwa Day | | |
| International Guide Dog Day | | |
| World Wish Day | | |
| Stop Food Waste Day | | |
| We Jump The World Day | | |
| St. James the Great Day | | |
| International Jazz Day | | |
| Carnival Day | | |
| Liberation Day/Reunification Day | | |
| Education Day | | |
| National Bubble Tea Day | | |
| National Sarcoidosis Day | | |
| National Military Brats Day | | |
| National PrepareAthon! Day | | |
| National Honesty Day | | |
| National Adopt a Shelter Pet Day | | |
| National Bugs Bunny Day | | |
| National Hairstylist Appreciation Day | | |
| National Oatmeal Cookie Day | | |
| National Raisin Day | | |
| National Poem In Your Pocket Day | | |
| Children's Day | | |
| Walpurgis Night | | |
| Feast of St Joseph the Worker | | |
| Workers' Day | | |
| Labor Day / May Day | | |
| Unity Day | | |
| Loyalty Day | | |
| Labor Day | | |
| Maharashtra Day | | |
| National Mother Goose Day | | |
| National Chocolate Parfait Day | | |
| Law Day | | |
| School Principals’ Day | | |
| Silver Star Service Banner Day | | |
| National Space Day | | |
| School Lunch Hero Day | | |
| No Pants Day | | |
| Agriculture and Labor Day | | |
| Lei Day | | |
| May Day | | |
| Great Prayer Day | | |
| Constitution Day | | |
| Spring and Labor Day | | |
| God of Medicine's Birthday | | |
| Labor and Solidarity Day | | |
| Constituent Assembly Convocation Day | | |
| Labor day | | |
| May 1st | | |
| Sturge-Weber Syndrome Awareness | | |
| National Hamburger Month | | |
| Wesak - Buddha Day | | |
| Buddha Purnima | | |
| Buddha Purnima/Vesak | | |
| National Executive Coaching Day | | |
| National Purebred Dog Day | | |
| Global Love Day | | |
| International Tuba Day | | |
| Lupus Awareness Month | | |
| National Blood Pressure Education Month | | |
| National Asparagus Month | | |
| Skin Cancer Awareness Month | | |
| National Inventor’s Month | | |
| National Photography Month | | |
| International Drum Month | | |
| National Bike Month | | |
| National Deck Safety Month | | |
| National Military Appreciation Month | | |
| National Moving Month | | |
| Celiac Disease Awareness Month | | |
| National Get Caught Reading Month | | |
| National Stroke Awareness Month | | |
| National Mental Health Awareness Month | | |
| Motorcycle Safety Awareness Month | | |
| National Brain Cancer And Brain Tumor Awareness Month | | |
| National Gardening Week | | |
| Therapeutic Massage Awareness Day | | |
| National Egg Month | | |
| National Salsa Month | | |
| National Salad Month | | |
| National Barbecue Month | | |
| National Strawberry Month | | |
| National Cystic Fibrosis Awareness Month | | |
| Correct Your Posture Month | | |
| National Chamber Music Month | | |
| National Mediterranean Diet Month | | |
| Older Americans Month | | |
| Better Speech And Language Month | | |
| National Foster Care Month | | |
| National Water Safety Month | | |
| National Wildfire Awareness Month | | |
| American Cheese Month | | |
| Date Your Mate Month | | |
| New Home Owners Day | | |
| Day of Madrid | | |
| National Truffle Day | | |
| National Life Insurance Day | | |
| National Fitness Day | | |
| National Scrapbook Day | | |
| National Homebrew Day | | |
| Join Hands Day | | |
| National Bombshells’ Day | | |
| National Start Seeing Monarchs Day | | |
| Free Comic Book Day | | |
| National Lemonade Day | | |
| National Explosive Ordnance Disposal (EOD) Day | | |
| World Tuna Day | | |
| Labor Day observed | | |
| Labor Day / May Day (2nd Day) | | |
| Day of the Flag | | |
| Labor Day (2nd Day) | | |
| Herb Day | | |
| National Skilled Trades Day | | |
| Baby Day | | |
| Beer Pong Day | | |
| National Brothers And Sisters Day | | |
| Wildfire Community Preparedness Day | | |
| Constitution Memorial Day | | |
| Cross Day | | |
| World Press Freedom Day | | |
| Constitution Day | | |
| National Lumpy Rug Day | | |
| National Garden Meditation Day | | |
| National Specially-Able Pets Day | | |
| National Two Different Colored Shoes Day | | |
| National Paranormal Day | | |
| National Chocolate Custard Day | | |
| National Raspberry Pop Over Day | | |
| National Textiles Day | | |
| National Infertility Survival Day | | |
| Mother's Day | | |
| World Laughter Day | | |
| National Pet Week | | |
| Greenery Day | | |
| Literary Day | | |
| Anniversary of the Decease of M. R. ŝtefánika | | |
| Independence Restoration Day | | |
| Youth Day | | |
| Cassinga Day | | |
| Kent State Shootings Remembrance | | |
| Rhode Island Independence Day | | |
| National Star Wars Day | | |
| National Weather Observers Day | | |
| National Renewal Day | | |
| National Orange Juice Day | | |
| National Candied Orange Peel Day | | |
| National Melanoma Monday | | |
| Labor Day | | |
| Labor Day / May Day | | |
| May Day | | |
| Saint Florian's Day | | |
| Early May Bank Holiday | | |
| Remembrance Day | | |
| Coronation Day | | |
| 45 Day | | |
| International Firefighters’ Day | | |
| Senior Citizens Day | | |
| Constitution Day of the Kyrgyz Republic | | |
| Liberation Day | | |
| Cinco de Mayo | | |
| Freedom Day | | |
| National Astronaut Day | | |
| National Cartoonists Day | | |
| National Silence the Shame Day | | |
| National Totally Chipotle Day | | |
| National Hoagie Day | | |
| National Foster Care Day | | |
| National Teacher Appreciation Day | | |
| Lag B'Omer | | |
| Arrival Day | | |
| Children's Day | | |
| Nail Day | | |
| World Asthma Day | | |
| Revenge Of The Fifth | | |
| International Midwives’ Day | | |
| Hug A Shed And Take A Selfie Day | | |
| Martyrs' Day | | |
| Day of Gorans | | |
| National Nurses Day | | |
| International No Diet Day | | |
| National Beverage Day | | |
| National Crepe Suzette Day | | |
| National School Nurse Day | | |
| St. George's Day | | |
| National Nurses Week | | |
| No Homework Day | | |
| National Tourist Appreciation Day | | |
| Soldiers' Day | | |
| Defender of the Fatherland Day | | |
| National Packaging Design Day | | |
| National Paste-Up Day | | |
| National Barrier Awareness Day | | |
| National Roast Leg of Lamb Day | | |
| National Day of Reason | | |
| World Password Day | | |
| National Day of Prayer | | |
| Pahang State Holiday | | |
| National Cosmopolitan Day | | |
| National Tourism Day | | |
| Time of Remembrance and Reconciliation for Those Who Lost Their Lives during the Second World War | | |
| Parents' Day | | |
| World Ovarian Cancer Day | | |
| Day of liberation | | |
| Truman Day | | |
| National Coconut Cream Pie Day | | |
| National Have A Coke Day | | |
| National Provider Appreciation Day | | |
| Victory Day | | |
| Military Spouse Appreciation Day | | |
| No Socks Day | | |
| World Donkey Day | | |
| Iris Day | | |
| National Public Gardens Day | | |
| Free Trade Day | | |
| Europe Day | | |
| National Lost Sock Memorial Day | | |
| National Moscato Day | | |
| National Butterscotch Brownie Day | | |
| National Sleepover Day | | |
| National Birth Mother’s Day | | |
| National Babysitter’s Day | | |
| National Dog Mom’s Day | | |
| National Train Day | | |
| National Archery Day | | |
| Cornelia De Lange Syndrome Awareness Day | | |
| Stamp Out Hunger Food Drive Day | | |
| Victory Day | | |
| Matsu's Birthday | | |
| Remembrance Day | | |
| Liberation Day (except Alderney and Sark) | | |
| Liberation Day | | |
| World Migratory Bird Day | | |
| National Miniature Golf Day | | |
| World Belly Dance Day | | |
| National Windmill Day | | |
| World Buckfast Day | | |
| Constitution Day | | |
| National Clean Up Your Room Day | | |
| National Lipid Day | | |
| National Shrimp Day | | |
| Mother's Day | | |
| Confederate Memorial Day | | |
| Day of the National Emblem and Flag of Belarus | | |
| Liberation Day (only Sark) | | |
| Monarchy Day | | |
| Father's Day | | |
| World Lupus Day | | |
| International Day Of Argania | | |
| Mother Ocean Day | | |
| One Day Without Shoes Day | | |
| National Eat What You Want Day | | |
| National Foam Rolling Day | | |
| National Twilight Zone Day | | |
| National Women’s Checkup Day | | |
| Confederate Memorial Day observed | | |
| Mother's Day | | |
| Gospel Day | | |
| Victory Day observed | | |
| Europe Day observed | | |
| World Ego Awareness Day | | |
| International Nurses Day | | |
| National Limerick Day | | |
| National Odometer Day | | |
| National Nutty Fudge Day | | |
| National Fibromyalgia Awareness Day | | |
| Primary Election Day | | |
| St. Andrew's Day | | |
| International Day Of Plant Health | | |
| National Crouton Day | | |
| National Frog Jumping Day | | |
| National Apple Pie Day | | |
| National Fruit Cocktail Day | | |
| National Receptionists Day | | |
| National Third Shift Workers Day | | |
| World Cocktail Day | | |
| International Hummus Day | | |
| Leprechaun Day | | |
| Donate A Day’s Wages To Charity Day | | |
| National Root Canal Appreciation Day | | |
| Top Gun Day | | |
| World Facilities Management Day | | |
| Independence Day | | |
| National Unification Day | | |
| Kamuzu Day | | |
| National Decency Day | | |
| National Dance Like a Chicken Day | | |
| National Buttermilk Biscuit Day | | |
| Ascension Day | | |
| Father's Day | | |
| Independence Day Holiday | | |
| Teachers' Day | | |
| Family Day | | |
| International Day of Families | | |
| Peace Officers Memorial Day | | |
| Feast Day of St Isidore | | |
| National Chocolate Chip Day | | |
| National Nylon Stocking Day | | |
| Bike to Work Day | | |
| National Endangered Species Day | | |
| National Pizza Party Day | | |
| NASCAR Day | | |
| National Defense Transportation Day | | |
| Yom Yerushalayim (Jerusalem Day) | | |
| Bring Flowers To Someone Day | | |
| National Straw Hat Day | | |
| International Virtual Assistants Day | | |
| Shades Day | | |
| National Police Week | | |
| International Vascular Birthmarks Awareness Day | | |
| SPLA Day | | |
| Honor Our LGBT Elders Day | | |
| National Do Something Good for Your Neighbor Day | | |
| National Love a Tree Day | | |
| National Piercing Day | | |
| National Sea Monkey Day | | |
| National Biographer’s Day | | |
| National Coquilles Saint Jacques Day | | |
| National Learn to Swim Day | | |
| Armed Forces Day | | |
| Europe Day | | |
| Savitri Puja | | |
| World Whisky Day | | |
| Horse Rescue Day | | |
| National Barbecue Day | | |
| National Waiters Day | | |
| Drawing Day | | |
| World Fiddle Day | | |
| International Day Of Light | | |
| Plant A Lemon Tree Day | | |
| International Day Of Living Together In Peace | | |
| World Telecommunication and Information Society Day | | |
| Constitution Day | | |
| 17 May Constitution Day (1814) | | |
| Galicia Literature Day | | |
| Liberation Day | | |
| National Pack Rat Day | | |
| National Cherry Cobbler Day | | |
| National Graduation Tassel Day | | |
| National Walnut Day | | |
| Take Your Parents To The Playground Day | | |
| National Work From Home Day | | |
| World Baking Day | | |
| National Pinot Grigio Day | | |
| World Neurofibromatosis Awareness Day | | |
| International Heritage Breeds Week | | |
| Day of Revival, Unity, and the Poetry of Magtymguly | | |
| Flag Day/University Day | | |
| International Museum Day | | |
| Battle of Las Piedras | | |
| National HIV Vaccine Awareness Day | | |
| National Visit Your Relatives Day | | |
| National No Dirty Dishes Day | | |
| National Cheese Soufflé Day | | |
| Victoria Day | | |
| National Patriots' Day | | |
| Discovery Day | | |
| Ascension Day | | |
| Commemoration of Atatürk, Youth and Sports Day | | |
| National Devil’s Food Cake Day | | |
| National May Ray Day | | |
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