April 4th, 2013 United Nations' Mine Awareness Day April 7th, 2013 United Nations' World Health Day April 7th, 2013 Day to Remember Rwanda Genocide Victims April 7th, 2013 Yom HaShoah April 12th, 2013 International Day of Human Space Flight April 15th, 2013 Tax Day April 15th, 2013 Patriot's Day April 15th, 2013 Father Damien Day April 16th, 2013 Emancipation Day April 16th, 2013 Yom HaAtzmaut April 21st, 2013 San Jacinto Day April 22nd, 2013 Oklahoma Day April 22nd, 2013 Confederate Memorial Day April 22nd, 2013 Earth Day April 23rd, 2013 World Book and Copyright Day April 24th, 2013 Administrative Professionals Day April 25th, 2013 World Malaria Day April 26th, 2013 World Intellectual Property Day April 26th, 2013 Arbor Day April 28th, 2013 World Day for Safety and Health at Work April 28th, 2013 Lag B'Omer April 29th, 2013 Day to Remember Chemical Warfare Victims May 1st, 2013 Loyalty Day May 1st, 2013 Law Day May 2nd, 2013 National Day of Prayer May 3rd, 2013 World Press Freedom Day May 3rd, 2013 Orthodox Good Friday May 4th, 2013 Rhode Island Independence Day May 4th, 2013 Orthodox Holy Saturday May 5th, 2013 Orthodox Easter May 5th, 2013 Cinco de Mayo May 6th, 2013 Orthodox Easter Monday
