May 3, 2012 World Press Freedom Day
May 3, 2012 National Day of Prayer
May 4, 2012 Kent State Shootings Remembrance
May 4, 2012 Kentucky Oaks
May 4, 2012 Rhode Island Independence Day
May 5, 2012 Cinco de Mayo
May 5, 2012 Kentucky Derby
May 5, 2012 National Explosive Ordnance Disposal (EOD) Day
May 6, 2012 National Nurses Day
May 8, 2012 Time of Remembrance and Reconciliation for Those Who Lost Their Lives during the Second World War
May 8, 2012 Victory in Europe Day
May 8, 2012 Primary Election Day
May 8, 2012 Primary Election Day
May 10, 2012 Confederate Memorial Day
May 11, 2012 Native American Day
May 12, 2012 World Migratory Bird Day
May 12, 2012 International Nurses Day
May 13, 2012 Mother's Day
May 15, 2012 International Day of Families
May 15, 2012 Peace Officers Memorial Day
May 17, 2012 Ascension Day
May 17, 2012 World Information Society Day
May 18, 2012 National Defense Transportation Day
May 19, 2012 Armed Forces Day
May 19, 2012 Preakness Stakes
May 20, 2012 World Autoimmune Arthritis Day
May 21, 2012 World Day for Cultural Diversity for Dialogue and Development
May 22, 2012 International Day for Biological Diversity
May 22, 2012 National Maritime Day
May 22, 2012 Harvey Milk Day
May 23, 2012 Emergency Medical Services for Children Day
May 25, 2012 African Liberation Day
May 25, 2012 National Missing Children's Day
May 28, 2012 Memorial Day
May 28, 2012 Jefferson Davis' Birthday
May 29, 2012 International Day of United Nations Peacekeepers
May 31, 2012 World No Tobacco Day