US Federal & Popular Holidays - 2021
| Free Comic Book Day | Sa | ||
| Kentucky Derby | Sa | ||
| May Day | Sa | ||
| National College Decision Day | Sa | ||
| World Lyme Day | Sa | ||
| Orthodox Easter | Su | ||
| World Laughter Day | Su | ||
| World Tuna Day | Su | ||
| St James TL / St Philip | Mo | ||
| World Press Freedom Day | Mo | ||
| National Teacher Day | Tu | ||
| Star Wars Day | Tu | ||
| World Asthma Day | Tu | ||
| Cinco De Mayo | We | ||
| National Day of Prayer | Th | ||
| National Nurses Day | Th | ||
| Military Spouse Appreciation Day | Fr | ||
| Time of Remembrance and Reconciliation... | Sa | ||
| World Migratory Bird Day | Sa | ||
| Lailatul Qadr | Su | ||
| Mother's Day | Su | ||
| Eat What You Want Day | Tu | ||
| Ascension | Th | ||
| Eid al Fitr Starts | Th | ||
| Armed Forces Day | Sa | ||
| International Day of Families | Sa | ||
| National Chocolate Chip Day | Sa | ||
| International Day of Light | Su | ||
| Int'l. Day of Living Together in Peace | Su | ||
| MTV Movie and TV Awards | Su | ||
| Shavuot (Start) | Mo | ||
| Tax Day (Taxes Due) | Mo | ||
| World Telecommunication and Information... | Mo | ||
| International Museum Day | Tu | ||
| National Rescue Dog Day | Th | ||
| World Bee Day | Th | ||
| Bike To Work Day | Fr | ||
| Endangered Species Day | Fr | ||
| World Day for Cultural Diversity for... | Fr | ||
| International Day for Biological... | Sa | ||
| World Goth Day | Sa | ||
| Pentecost | Su | ||
| Billboard Awards | Su | ||
| International Day to End Obstetric... | Su | ||
| World Turtle Day | Su | ||
| National Brother Day | Mo | ||
| National Wine Day | Tu | ||
| Towel Day | Tu | ||
| Vesak Day | We | ||
| National Burger Day | Fr | ||
| International Day of UN Peacekeepers | Sa | ||
| National Biscuit Day | Sa | ||
| Trinity Sunday | Su | ||
| World MS Day | Su | ||
| World Otter Day | Su | ||
| Memorial Day | Mo | ||
| CFDA Fashion Awards | Mo | ||
| World No Tobacco Day | Mo |
