When is World Down Syndrome Day in United States?

March 1, St. David's Day March 1, Ramadan Starts March 1, Zero Discrimination Day March 1, Self-Injury Awareness Day March 2, Texas Independence Day March 3, Casimir Pulaski Day March 3, Read Across America Day March 3, World Wildlife Day March 4, Shrove Tuesday/Mardi Gras March 4, Town Meeting Day March 5, Ash Wednesday March 7, Employee Appreciation Day March 8, International Women's Day March 9, Daylight Saving Time starts March 13, World Kidney Day March 14, Purim March 17, Evacuation Day March 17, St. Patrick's Day March 20, March Equinox March 20, International Day of Happiness March 21, International Day for the Elimination of Racial Discrimination March 21, International Day of Forests March 21, World Down Syndrome Day March 21, International Day of Nowruz March 21, World Poetry Day March 22, World Water Day March 23, World Meteorological Day March 24, International Day for the Right to the Truth concerning Gross Human Rights Violations and for the Dignity of Victims March 24, World Tuberculosis Day March 25, International Day of Remembrance of Slavery Victims and the Transatlantic Slave Trade March 25, Maryland Day March 25, International Day of Solidarity with Detained and Missing Staff Members March 26, Lailat al-Qadr March 26, Prince Jonah Kuhio Kalanianaole Day March 29, National Vietnam War Veterans Day March 29, Earth Hour March 31, César Chávez Day March 31, Eid al-Fitr March 31, Seward's Day