Original 1st printing 8&1/2 x 11" concert/event flyer for the Gathering of the Tribes/Human Be-In ("Pow Wow"), held at the Polo Grounds in San Francisco's Golden Gate Park on 1/14/1967.
 
 Flyer lists appearances by counterculture heroes Lenore Kandel, Timothy Leary, Michael McClure, Allen Ginsberg, Gary Snyder, Richard Alpert, Jerry Rubin, Dick Gregory, Lawrence Ferlinghetti, "all SF rock bands" (which included Jefferson Airplane, Quicksilver Messenger Service and the Grateful Dead, although none are mentioned by name).
 
 Art by Michael Bowen (this is the version with a map to the event in the central image area), thin flat stock flyer (*GREEN stock version) is in near mint to excellent (A-/B+ to B+) condition; other than a few ultra-soft handling dings here and there, a tiny pressure crease/nip tear along the upper left margin and a few tiny edge bends, it is a FANTASTIC-looking example of this somewhat uncommon/hard-to-find version of the "Pow-Wow" flyer.

Check out 26 minutes of footage from the event HERE:
 
https://www.youtube.com/watch?v=HTGyFgyB5Q8