| 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 | | |
