May 1, 2015 Kentucky Oaks
May 2, 2015 Kentucky Derby
May 2, 2015 National Explosive Ordnance Disposal (EOD) Day
May 3, 2015 World Press Freedom Day
May 4, 2015 Kent State Shootings Remembrance
May 4, 2015 Rhode Island Independence Day
May 5, 2015 Cinco de Mayo
May 5, 2015 Primary Election Day
May 6, 2015 National Nurses Day
May 7, 2015 National Day of Prayer
May 8, 2015 Time of Remembrance and Reconciliation for Those Who Lost Their Lives during the Second World War
May 8, 2015 World Ovarian Cancer Day
May 8, 2015 Victory in Europe Day
May 8, 2015 Native American Day
May 8, 2015 Military Spouse Appreciation Day
May 9, 2015 World Migratory Bird Day
May 10, 2015 Mother's Day
May 10, 2015 Confederate Memorial Day
May 10, 2015 Confederate Memorial Day
May 11, 2015 Confederate Memorial Day observed
May 12, 2015 International Nurses Day
May 14, 2015 Ascension Day
May 15, 2015 International Day of Families
May 15, 2015 Peace Officers Memorial Day
May 15, 2015 National Defense Transportation Day
May 16, 2015 Isra and Mi'raj
May 16, 2015 Armed Forces Day
May 16, 2015 Preakness Stakes
May 17, 2015 World Information Society Day
May 20, 2015 World Autoimmune Arthritis Day
May 20, 2015 Emergency Medical Services for Children Day
May 21, 2015 World Day for Cultural Diversity for Dialogue and Development
May 22, 2015 International Day for Biological Diversity
May 22, 2015 National Maritime Day
May 22, 2015 Harvey Milk Day
May 23, 2015 International Day to End Obstetric Fistula
May 25, 2015 African Liberation Day
May 25, 2015 Memorial Day
May 25, 2015 Jefferson Davis' Birthday
May 25, 2015 National Missing Children's Day
May 29, 2015 International Day of United Nations Peacekeepers
May 31, 2015 Trinity Sunday
May 31, 2015 World No Tobacco Day