| National Hangover Day | |  |
| National Fruitcake Toss Day | | |
| National Bobblehead Day | | |
| National Bubble Bath Day | | |
| National JoyGerm Day | | |
| National Step in the Puddle and Splash Your Friends Day | | |
| National Shop for Travel Day | | |
| National Rubber Ducky Day | | |
| National Sticker Day | | |
| International Kite Day | | |
| Nothing Day | | |
| National Winnie The Pooh Day | | |
| One-Liners Day | | |
| Global Belly Laugh Day | | |
| National Compliment Day | | |
| National Opposite Day | | |
| International Lego Day | | |
| National Kazoo Day | | |
| National Big Wig Day | | |
| National Fun At Work Day | | |
| National Puzzle Day | | |
| National Draw A Dinosaur Day | | |
| National Inane Answering Message Day | | |
| National Backward Day | | |
| Bubble Gum Day | | |
| National Shower with a Friend Day | | |
| Ice Cream for Breakfast Day | | |
| Laugh and Get Rich Day | | |
| National Kite Flying Day | | |
| Annoy Squidward Day | | |
| National Gumdrop Day | | |
| International Tug Of War Day | | |
| National Tell a Fairy Tale Day | | |
| National Pokemon Day | | |
| National Tooth Fairy Day | | |
| Toy Soldier Day | | |
| Cinco de Marcho | | |
| National Sock Monkey Day | | |
| National Barbie Day | | |
| International Day Of Awesomeness | | |
| Mario Day | | |
| Ken Day | | |
| St. Urho’s Day | | |
| National Let’s Laugh Day | | |
| National Goof Off Day | | |
| April Fool's Day | | |
| Fun Day | | |
| International Fun At Work Day | | |
| National Humor Month | | |
| International Pillow Fight Day | | |
| World Party Day | | |
| National No Housework Day | | |
| Draw A Picture Of A Bird Day | | |
| National Unicorn Day | | |
| Walk On Your Wild Side Day | | |
| National Scrabble Day | | |
| International Moment of Laughter Day | | |
| National That Sucks Day | | |
| National Piñata Day | | |
| International Dance Day | | |
| National Bugs Bunny Day | | |
| Beer Pong Day | | |
| World Laughter Day | | |
| Hug A Shed And Take A Selfie Day | | |
| National Miniature Golf Day | | |
| National Limerick Day | | |
| Drawing Day | | |
| Take Your Parents To The Playground Day | | |
| National Pizza Party Day | | |
| Rapture Party Day | | |
| National Solitaire Day | | |
| National Lucky Penny Day | | |
| National Scavenger Hunt Day | | |
| Sing Out Day | | |
| National Paper Airplane Day | | |
| National Grape Popsicle Day | | |
| National Hole In My Bucket Day | | |
| National Smile Day | | |
| International Tabletop Day | | |
| National Bubba Day | | |
| National Yo-Yo Day | | |
| Love Island Day | | |
| National Upsy Daisy Day | | |
| National Donald Duck Day | | |
| World Doll Day | | |
| International Bath Day | | |
| National Splurge Day | | |
| National Garfield the Cat Day | | |
| World Juggling Day | | |
| National Selfie Day | | |
| International Fairy Day | | |
| National Tell An Old Joke Day | | |
| National Leon Day | | |
| International Joke Day | | |
| Be A Kid Again Day | | |
| Video Games Day | | |
| National Swimming Pool Day | | |
| Eat Your Jello Day | | |
| National Be A Dork Day | | |
| World Emoji Day | | |
| International Chess Day | | |
| National Fortune Cookie Day | | |
| National Hammock Day | | |
| Carousel Day | | |
| Gary Gygax Day | | |
| National Walk On Stilts Day | | |
| National Waterpark Day | | |
| National Mahjong Day | | |
| Odie Day | | |
| National Presidential Joke Day | | |
| Play In The Sand Day | | |
| Friday the 13th | | |
| National Roller Coaster Day | | |
| National Tell a Joke Day | | |
| National Bad Poetry Day | | |
| Serendipity Day | | |
| National Tooth Fairy Day | | |
| Never Bean Better Day | | |
| National Cherry Popsicle Day | | |
| Race Your Mouse Around The Icons Day | | |
| National Slinky Day | | |
| National Blueberry Popsicle Day | | |
| International Sudoku Day | | |
| National Teddy Bear Day | | |
| No News Is Good News Day | | |
| National Video Game Day | | |
| National Play-Doh Day | | |
| National Table Shuffleboard Day | | |
| Big Whopper Liar Day | | |
| Boys’ and Girls’ Club Day for Kids | | |
| National Dance Day | | |
| International Talk Like a Pirate Day | | |
| Miniature Golf Day | | |
| National Girls’ Night In Day | | |
| Binge Day | | |
| National Chewing Gum Day | | |
| Balloons Around the World Day | | |
| World Smile Day | | |
| National Get Funky Day | | |
| American Touch Tag Day | | |
| National Chess Day | | |
| National Costume Swap Day | | |
| National Motorcycle Ride Day | | |
| It's My Party Day | | |
| International Top Spinning Day | | |
| National Bring Your Teddy Bear to Work/School Day | | |
| National Color Day | | |
| Plush Animal Lover’s Day | | |
| National Frankenstein Friday | | |
| National Doorbell Day | | |
| National Knock-Knock Jokes Day | | |
| National Magic Day | | |
| National Jersey Friday | | |
| National Hug A Bear Day | | |
| Happy Hour Day | | |
| Have A Party With Your Bear Day | | |
| National Princess Day | | |
| National Play Monopoly Day | | |
| Bingo’s Birthday Month | | |
| National Dice Day | | |
| Bathtub Party Day | | |
| Weary Willie Day | | |
| Barbie and Barney Backlash Day | | |
| National Ugly Christmas Sweater Day | | |
| Games Day | | |
| Crossword Puzzle Day | | |
| National Card Playing Day | | |
