ADVANCE FOR USE TUESDAY, JUNE 13, 2017 AND THEREAFTER-FILE - In this Jan. 15, 1967 file photo, Timothy Leary, center, leads thousands in a song at the "Human Be-In" on the Golden Gate Park Polo Fields in San Francisco. Dennis McNally, who has curated an exhibit at the California Historical Society, says the national media paid little attention to San Francisco's psychedelic community until January 1967, when poets and bands joined forces for the “Human Be-In,” which unexpectedly drew about 50,000 people. Leary stood on stage and delivered his famous mantra: “Turn on. Tune In. Drop out.” (AP Photo)
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