Dignitaries at the front of the Freedom Walk include, left to right, Rev. Wendell Anthony, president of the Detroit Branch of the NAACP; Martin Luther King, III; Rev. Al Sharpton of the National Action Network, Roslyn Brock, chairman of the NAACP; Detroit Mayor Dave Bing; and Rev. Jesse Jackson of the Rainbow Push Coalition Saturday, June 22, 2013 in Detroit. (AP Photo/Detroit News, John T. Greilick) DETROIT (AP) — Thousands participated in a Detroit march commemorating the 50th anniversary of one that Martin Luther King Jr. led in 1963. The walk down Woodward Avenue on Saturday morning culminated in a riverfront rally at Hart Plaza. The civil rights icon visited Detroit on June 23, 1963, to lead tens of thousands in a freedom walk and also previewed his “I Have a Dream” speech.