May 1, 2009 Kentucky Oaks
May 2, 2009 Kentucky Derby
May 3, 2009 World Press Freedom Day
May 4, 2009 Kent State Shootings Remembrance
May 4, 2009 Rhode Island Independence Day
May 5, 2009 Cinco de Mayo
May 6, 2009 National Nurses Day
May 7, 2009 National Day of Prayer
May 8, 2009 Time of Remembrance and Reconciliation for Those Who Lost Their Lives during the Second World War
May 8, 2009 Victory in Europe Day
May 9, 2009 World Migratory Bird Day
May 10, 2009 Mother's Day
May 10, 2009 Confederate Memorial Day
May 11, 2009 Confederate Memorial Day observed
May 12, 2009 International Nurses Day
May 15, 2009 International Day of Families
May 15, 2009 Peace Officers Memorial Day
May 15, 2009 National Defense Transportation Day
May 16, 2009 Armed Forces Day
May 16, 2009 Preakness Stakes
May 17, 2009 World Information Society Day
May 20, 2009 Emergency Medical Services for Children Day
May 21, 2009 Ascension Day
May 21, 2009 World Day for Cultural Diversity for Dialogue and Development
May 22, 2009 International Day for Biological Diversity
May 22, 2009 National Maritime Day
May 25, 2009 African Liberation Day
May 25, 2009 Memorial Day
May 25, 2009 Jefferson Davis' Birthday
May 25, 2009 National Missing Children's Day
May 29, 2009 International Day of United Nations Peacekeepers
May 31, 2009 World No Tobacco Day