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Gathering of the Tribes for a Human Be-In poster was created for an event held on January 14, 1967, at the Polo Field in Golden Gate Park, San Francisco. The event is considered a prelude to the "Summer of Love" and a major gathering for the 1960s counterculture movement. 
Key details about the event:
    Purpose: The event was a peaceful gathering and a protest against a new California law that made the psychedelic drug LSD illegal.
    Attendees: The event drew an estimated 20,000 to 30,000 people, including artists, poets, musicians, and activists.
    Speakers and Performers: The poster lists speakers like Timothy Leary, Allen Ginsberg, Richard Alpert (Ram Dass), Jerry Rubin, Dick Gregory, and poets Michael McClure, Gary Snyder, and Lenore Kandel. Music was provided by "all San Francisco rock groups," such as the Grateful Dead, Jefferson Airplane, and Quicksilver Messenger Service.
    Poster Design: The poster was designed by artists Stanley Mouse and Alton Kelley and is considered an iconic image of the era. It is noted for its psychedelic art style, which was heavily influenced by Art Nouveau. The central image on the poster is a photograph of a sadhu, a Hindu holy man.  | 
	
	
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