April 8th, 2021 Yom HaShoahApril 12th, 2021 International Day of Human Space FlightApril 13th, 2021 Ramadan beginsApril 15th, 2021 Tax DayApril 15th, 2021 Yom HaAtzmautApril 15th, 2021 Father Damien DayApril 16th, 2021 Emancipation DayApril 19th, 2021 Patriot's DayApril 21st, 2021 San Jacinto DayApril 21st, 2021 Administrative Professionals DayApril 22nd, 2021 Oklahoma DayApril 22nd, 2021 Earth DayApril 23rd, 2021 World Book and Copyright DayApril 25th, 2021 World Malaria DayApril 26th, 2021 World Intellectual Property DayApril 26th, 2021 Confederate Memorial DayApril 28th, 2021 World Day for Safety and Health at WorkApril 29th, 2021 Day to Remember Chemical Warfare VictimsApril 30th, 2021 Orthodox Good FridayApril 30th, 2021 Lag B'OmerApril 30th, 2021 Arbor DayMay 1st, 2021 Law DayMay 1st, 2021 Loyalty DayMay 1st, 2021 Orthodox Holy SaturdayMay 2nd, 2021 Orthodox EasterMay 3rd, 2021 World Press Freedom DayMay 3rd, 2021 Orthodox Easter MondayMay 4th, 2021 Rhode Island Independence DayMay 5th, 2021 Cinco de MayoMay 6th, 2021 National Day of PrayerMay 7th, 2021 'Truman Day' observedMay 8th, 2021 Laylat al-QadrMay 8th, 2021 Truman DayMay 8th, 2021 Time to Remember Lost Lives From World War IIMay 9th, 2021 Mother's DayMay 10th, 2021 Confederate Memorial DayMay 13th, 2021 Eid-al-FitrMay 13th, 2021 Ascension DayMay 14th, 2021 World Migratory Bird DayMay 15th, 2021 International Day of FamiliesMay 15th, 2021 Peace Officers Memorial DayMay 15th, 2021 Armed Forces DayMay 17th, 2021 World Information Society DayMay 17th, 2021 ShavuotMay 21st, 2021 World Day for Cultural DiversityMay 21st, 2021 National Defense Transportation DayMay 22nd, 2021 World Biological Diversity DayMay 22nd, 2021 National Maritime DayMay 23rd, 2021 PentecostMay 24th, 2021 Whit MondayMay 25th, 2021 African Liberation DayMay 29th, 2021 International Day of United Nations PeacekeepersMay 30th, 2021 Trinity SundayMay 31st, 2021 Jefferson Davis BirthdayMay 31st, 2021 World No Tobacco DayMay 31st, 2021 Memorial DayJune 1st, 2021 Statehood Day