| Z Day | |  |
| National Thank God It’s Monday Day | | |
| National Pass Gas Day | | |
| Peculiar People Day | | |
| National Step in the Puddle and Splash Your Friends Day | | |
| Kiss A Ginger Day | | |
| National Rubber Ducky Day | | |
| Brew A Potion Day | | |
| Blue Monday | | |
| Answer Your Cat's Questions Day | | |
| Global Belly Laugh Day | | |
| National Talk Like A Grizzled Prospector Day | | |
| National Bubble Wrap Appreciation Day | | |
| Plan for Vacation Day | | |
| Hell Is Freezing Over Day | | |
| National Gorilla Suit Day | | |
| Extraterrestrial Culture Day | | |
| Annoy Squidward Day | | |
| National Do A Grouch a Favor Day | | |
| Hoodie Hoo Day | | |
| World Sword Swallowers Day | | |
| No Brainer Day | | |
| National Public Sleeping Day | | |
| Finisher’s Medal Day | | |
| What If Cats And Dogs Had Opposable Thumbs Day | | |
| March Forth and Do Something Day | | |
| Learn What Your Name Means Day | | |
| Be Nasty Day | | |
| National Open an Umbrella Indoors Day | | |
| Steak and BJ Day | | |
| National Awkward Moments Day | | |
| National Countdown Day | | |
| National Goof Off Day | | |
| Make Up Your Own Holiday Day | | |
| National Joe Day | | |
| National Scribble Day | | |
| National Virtual Vacation Day | | |
| National Find a Rainbow Day | | |
| International Firewalk Day | | |
| National Walk Around Things Day | | |
| Tell a Lie Day | | |
| National Read a Road Map Day | | |
| National Name Yourself Day | | |
| National Unicorn Day | | |
| National Big Wind Day | | |
| Cake and Cunnilingus Day | | |
| National Reach as High as You Can Day | | |
| National Take a Wild Guess Day | | |
| National That Sucks Day | | |
| Bicycle Day | | |
| National Take a Chance Day | | |
| National Hairball Awareness Day | | |
| Alien Day | | |
| National Superhero Day | | |
| No Pants Day | | |
| National Lumpy Rug Day | | |
| National Paranormal Day | | |
| National Two Different Colored Shoes Day | | |
| National Dog Mom’s Day | | |
| National Lost Sock Memorial Day | | |
| National Frog Jumping Day | | |
| National Dance Like a Chicken Day | | |
| Rapture Party Day | | |
| Talk Like Yoda Day | | |
| Put a Pillow on Your Fridge Day | | |
| National Hole In My Bucket Day | | |
| National Pop Goes the Weasel Day | | |
| National Take Back the Lunch Break Day | | |
| World UFO Day | | |
| Sidewalk Egg Frying Day | | |
| National Different Colored Eyes Day | | |
| Pandemonium Day | | |
| Stick Out Your Tongue Day | | |
| National Get Out of the Dog House Day | | |
| National All or Nothing Day | | |
| Take Your Houseplant For A Walk Day | | |
| Take Your Pants For A Walk Day | | |
| National Talk in an Elevator Day | | |
| Psychic Day | | |
| National Wiggle Your Toes Day | | |
| National Presidential Joke Day | | |
| National Just Because Day | | |
| Crackers Over The Keyboard Day | | |
| National Chicken Boy’s Day | | |
| National No Rhyme Nor Reason Day | | |
| Bison Ten Yell Day | | |
| Wonderful Weirdos Day | | |
| Supernatural Day | | |
| International Talk Like a Pirate Day | | |
| Hobbit Day | | |
| Checkers Day | | |
| National One-Hit Wonder Day | | |
| National Name Your Car Day | | |
| National Mad Hatter Day | | |
| Curious Events Day | | |
| International Skeptics Day | | |
| National Grouch Day | | |
| Wear Something Gaudy Day | | |
| Caps Lock Day | | |
| Chucky, The Notorious Killer Doll Day | | |
| Howl at the Moon Day and Night | | |
| National Dunce Day | | |
| Tongue Twister Day | | |
| Sadie Hawkins Day | | |
| Have A Bad Day Day | | |
| National Absurdity Day | | |
| False Confession Day | | |
| Bathtub Party Day | | |
| Pretend To Be A Time Traveler Day | | |
| Official Lost and Found Day | | |
| National Ding-a-Ling Day | | |
| Barbie and Barney Backlash Day | | |
| Stupid Toy Day | | |
| Answer The Telephone Like Buddy The Elf Day | | |
| National Ugly Christmas Sweater Day | | |
| Don’t Make Your Bed Day | | |
| Humbug Day | | |
| Phileas Fogg Win A Wager Day | | |
| Festivus | | |
| A'phabet Day or No "L" Day | | |
| National Whiner’s Day | | |
| Unlucky Day | | |
