In June 1963, King spoke in Detroit and opened with the same recognition of Abraham Lincoln and the Emancipation Proclamation before noting that 100 years later, Black people in the U.S. were not free.

Source: https://ktar.com/story/5531253/mlks-dream-for-america-is-one-of-the-stars-of-the-60th-anniversary-of-the-1963-march-on-washington/

King invited Jones to see him as the guest preacher at Friendship Baptist Church in Los Angeles, and Jones watched as King spoke before a standing-room-only crowd and called for Black professionals to support the civil rights movement.

Source: https://www.startribune.com/at-92-mlks-speechwriter-confronts-a-new-insane-moment-in-u-s-history/600299878/