The film centers on an extraordinary, one-afternoon-only reunion in 1972, bringing together the surviving luminaries of the Harlem Renaissance at the home of Duke Ellington. This unique gathering offered a final opportunity for these artists and scholars to reconnect, share their stories, and engage in spirited discussions about the movement's legacy and the broader landscape of Black cultural and political life in America.

What makes Once Upon a Time in Harlem particularly compelling is its foundation: nearly 30 hours of raw footage captured by the legendary filmmaker William Greaves, David Greaves' father and Liani Greaves' grandfather. David Greaves, who was one of the original cameramen on the 1972 shoot, shared insights into his father's vision for the project. William Greaves, a true Renaissance man himself — an actor, sculptor, poet, dancer, songwriter, and filmmaker — envisioned the finished product "to be a theatrical experience that moves at a snappy pace."

On the 'Doc Talk' podcast, hosted by Oscar winner John Ridley and Deadline's senior documentary editor Matt Carey, David and Liani Greaves discussed the intricate process of crafting their nonfiction feature from this invaluable archival material. They explored the complex interpersonal dynamics that unfolded during the reunion, noting the spirited debates that arose over how to define the Harlem Renaissance and whether its influence would endure or fade. The filmmakers also highlighted the often-overlooked yet integral role of women in the movement, recalling moments of friction as some women strove to make their voices heard amidst the lively conversations.

Liani Greaves offered a glimpse into some of the more contentious moments not included in the final cut, such as the strong emotions triggered by the presence of George Schuyler due to his contrarian political views. Oscar winner John Ridley also revealed his personal connection to the film, specifically identifying with comments made by Richard Bruce Nugent, one of the fascinating figures featured. The documentary is set for theatrical release in New York this Friday, followed by Los Angeles on October 23. The full 'Doc Talk' episode is available on major podcast platforms.