The documentary, Revival69: The Concert That Rocked The World, details how promoters John Brower and Kenny Walker were able to book Lennon for the show and how his appearance almost didn't happen. In the end he took the stage for a debut performance of The Plastic Ono Band, which featured Yoko Ono, Eric Clapton, Klaus Voormann and Alan White.
The film features archival footage from the late director D. A. Pennebaker, who shot the festival for the 1969 documentary Sweet Toronto.
Revival69: The Concert That Rocked The World will be released in theaters and digitally on June 28.