Martin Luther King Jr. addresses a crowd of 20,000 West Berliners on Sunday, in Waldbühne.

Martin Luther King Jr. was an American Baptist minister, civil rights activist and political philosopher who was a leader of the civil rights movement from 1955 until his assassination in 1968. He advanced civil rights for people of color in the United States through the use of nonviolent resistance and civil disobedience against Jim Crow laws and other forms of legalized discrimination.

The Waldbühne is an amphitheatre at Olympiapark Berlin in Berlin, Germany. It was designed by German architect Werner March in emulation of a Greek theatre and built between 1934 and 1936 as the Dietrich-Eckart-Freilichtbühne, a Nazi Thingplatz, and opened in association with the 1936 Summer Olympics. Since World War II it has been used for a variety of events, including boxing matches, film showings and classical and rock concerts. It seats more than 22,000 people. The venue is located off Friedrich-Friesen-Allee just northeast of Glockenturmstraße.

September 13 is the 256th day of the year in the Gregorian calendar; 109 days remain until the end of the year.