| 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 | | |
| Bike to Work Day | | |
| National Endangered Species Day | | |
| National Pizza Party Day | | |
| NASCAR Day | | |
| National Defense Transportation Day | | |
| National Work From Home Day | | |
| International Virtual Assistants Day | | |
| National Pinot Grigio Day | | |
| Shades Day | | |
| World Neurofibromatosis Awareness Day | | |
| 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 | | |
| National Learn to Swim Day | | |
| Armed Forces Day | | |
| Pentecost Eve | | |
| Europe Day | | |
| Astronomy Day | | |
| World Whisky Day | | |
| World Fiddle Day | | |
| Plant A Lemon Tree Day | | |
| Commemoration of Atatürk, Youth and Sports Day | | |
| National Devil’s Food Cake Day | | |
| Take Your Parents To The Playground Day | | |
| Pentecost / Whit Sunday | | |
| National May Ray Day | | |
| World Baking Day | | |
| International Heritage Breeds Week | | |
| Restoration of Independence Day | | |
| National Day | | |
| National Be a Millionaire Day | | |
| National Pick Strawberries Day | | |
| National Rescue Dog Day | | |
| National Quiche Lorraine Day | | |
| Whit Monday | | |
| Victoria Day | | |
| National Patriots' Day | | |
| Discovery Day | | |
| World Autoimmune / Autoinflammatory Arthritis Day | | |
| Day of Remembrance | | |
| World Bee Day | | |
| Italian Beef Week | | |
| Weights & Measures Day | | |
| World Day for Cultural Diversity for Dialogue and Development | | |
| Navy Day | | |
| Independence Day | | |
| Talk Like Yoda Day | | |
| Saint Helena's Day | | |
| National American Red Cross Founder’s Day | | |
| National Waitstaff Day | | |
| National Strawberries and Cream Day | | |
| National Memo Day | | |
| International Tea Day | | |
| I Need A Patch For That Day | | |
| World Meditation Day | | |
| Rapture Party Day | | |
| International Day for Biological Diversity | | |
| Unity Day | | |
| Independence Day (2nd Day) | | |
| National Maritime Day | | |
| National Craft Distillery Day | | |
| National Solitaire Day | | |
| National Buy a Musical Instrument Day | | |
| National Vanilla Pudding Day | | |
| Emergency Medical Services for Children Day | | |
| Harvey Milk Day | | |
| World Goth Day | | |
| Sherlock Holmes Day | | |
| International Day to End Obstetric Fistula | | |
| Labor Day / May Day | | |
| Constitution Day | | |
| World Turtle Day | | |
| National Lucky Penny Day | | |
| National Taffy Day | | |
| Vlach’s National Day (for Vlach community) | | |
| Wesak - Buddha Day | | |
| Buddha Purnima | | |
| Buddha Purnima/Vesak | | |
| Vesak Full Moon Poya Day | | |
