Prayers calling for strength under adversity, celebration of freedom and a fair share of the country's resources kicked off a rally Saturday on the Washington Mall marking the 50th anniversary of the historic March on Washington.

The August 28, 1963, march made "I have a dream" the clarion call of the civil rights movement.

Saturday's event is the first of two rallies to mark the anniversary.

President Barack Obama headlines another event Wednesday, the exact anniversary of the March on Washington, where Martin Luther King Jr. delivered the now-famous speech at the Lincoln Memorial.
March on Washington: Throngs to mark 'I Have a Dream' anniversary -