May 2, 2013 National Day of Prayer
May 3, 2013 Orthodox Good Friday
May 3, 2013 World Press Freedom Day
May 3, 2013 Kentucky Oaks
May 4, 2013 Orthodox Holy Saturday
May 4, 2013 Kent State Shootings Remembrance
May 4, 2013 Kentucky Derby
May 4, 2013 Rhode Island Independence Day
May 4, 2013 National Explosive Ordnance Disposal (EOD) Day
May 5, 2013 Orthodox Easter
May 5, 2013 Cinco de Mayo
May 6, 2013 Orthodox Easter Monday
May 6, 2013 National Nurses Day
May 8, 2013 Time of Remembrance and Reconciliation for Those Who Lost Their Lives during the Second World War
May 8, 2013 World Ovarian Cancer Day
May 8, 2013 Victory in Europe Day
May 9, 2013 Ascension Day
May 10, 2013 Confederate Memorial Day
May 10, 2013 Native American Day
May 11, 2013 World Migratory Bird Day
May 12, 2013 International Nurses Day
May 12, 2013 Mother's Day
May 15, 2013 International Day of Families
May 15, 2013 Peace Officers Memorial Day
May 17, 2013 World Information Society Day
May 17, 2013 National Defense Transportation Day
May 18, 2013 Armed Forces Day
May 18, 2013 Preakness Stakes
May 20, 2013 World Autoimmune Arthritis Day
May 21, 2013 World Day for Cultural Diversity for Dialogue and Development
May 22, 2013 International Day for Biological Diversity
May 22, 2013 Emergency Medical Services for Children Day
May 22, 2013 National Maritime Day
May 22, 2013 Harvey Milk Day
May 23, 2013 International Day to End Obstetric Fistula
May 25, 2013 Day of Vesak
May 25, 2013 African Liberation Day
May 25, 2013 National Missing Children's Day
May 26, 2013 Trinity Sunday
May 27, 2013 Memorial Day
May 27, 2013 Jefferson Davis' Birthday
May 29, 2013 International Day of United Nations Peacekeepers
May 30, 2013 Corpus Christi
May 31, 2013 World No Tobacco Day