December 10, 1971. 17” x 22”. NEAR MINT. Unobtrusive, almost unnoticeable expert conservation to old corner pinholes, else Fine. Original poster announcing a benefit concert for John Sinclair at the Crisler Arena, Ann Arbor, Michigan. SIGNED by designer Gary Grimshaw in the lower right corner.

Among the participants listed are John Lennon and Yoko Ono who were convinced by Jerry Rubin to play at the rally after reading Ed Sanders' poem 'The Entrapment of John Sinclair') along with Archie Shepp, Phil Ochs, Up, David Peel, and Commander Cody. Surprise latecomer Stevie Wonder also performed but isn't listed. Speakers included Rennie Davis, Allen Ginsberg, Bobby Seale, Leni Sinclair, Jerry Rubin, and Ed Sanders.

John and Yoko performed the former's song for John Sinclair, Yoko's feminist rallying cry, 'Sisters, O Sisters', and their protest song against the American penal system, 'Attica State', none of which had been heard before.

This now legendary event, dubbed a "Political Woodstock" by Jerry Rubin, was Lennon's first concert appearance in America since the Beatles' final live concert at Candlestick Park in San Francisco, and helped catalyze John Sinclair's release from prison three days later. The consequences for Lennon of his engagement with drug-taking political radicals were increased FBI surveillance and a long-running legal battle against deportation.

John Sinclair was the manager of the band MC5 which was the house band for the White Panthers. At the time he was in jail for the possession of marijuana This image is pictured in the Art of Rock book on page 395 plate 4.194.