March 7 is the sixty-sixth day (sixty-seventh in leap years) in the Gregorian calendar; it marks the anniversary of Bloody Sunday: when a group of 600 civil rights marchers were brutally attacked by state and local police in Selma, Alabama. Famous March 7 birthdays include Wanda Sykes, Jenna Fischer, Laura Prepon. March 7th also marks National Be Heard Day and National Cereal Day.