May 1, 2008 Ascension Day
May 1, 2008 National Day of Prayer
May 2, 2008 Kentucky Oaks
May 3, 2008 World Press Freedom Day
May 3, 2008 Kentucky Derby
May 4, 2008 Kent State Shootings Remembrance
May 4, 2008 Rhode Island Independence Day
May 5, 2008 Cinco de Mayo
May 6, 2008 National Nurses Day
May 6, 2008 Primary Election Day
May 8, 2008 Yom Ha'atzmaut
May 8, 2008 Time of Remembrance and Reconciliation for Those Who Lost Their Lives during the Second World War
May 8, 2008 Victory in Europe Day
May 9, 2008 Confederate Memorial Day observed
May 10, 2008 World Migratory Bird Day
May 10, 2008 Confederate Memorial Day
May 11, 2008 Mother's Day
May 12, 2008 International Nurses Day
May 13, 2008 Primary Election Day
May 15, 2008 International Day of Families
May 15, 2008 Peace Officers Memorial Day
May 16, 2008 National Defense Transportation Day
May 17, 2008 World Information Society Day
May 17, 2008 Armed Forces Day
May 17, 2008 Preakness Stakes
May 18, 2008 Trinity Sunday
May 20, 2008 Day of Vesak
May 21, 2008 World Day for Cultural Diversity for Dialogue and Development
May 22, 2008 Corpus Christi
May 22, 2008 International Day for Biological Diversity
May 22, 2008 National Maritime Day
May 25, 2008 African Liberation Day
May 25, 2008 National Missing Children's Day
May 26, 2008 Memorial Day
May 26, 2008 Jefferson Davis' Birthday
May 29, 2008 International Day of United Nations Peacekeepers
May 31, 2008 World No Tobacco Day