Vintage RICK GRIFFIN Poster'POW WOW HUMAN BE-IN' 1967 Summer Of Love 3rd print. Golden Gate Park Polo Grounds 1/14/1967. Light mark lower left corner. Rick Griffin Pow-Wow - A Gathering of the Tribes Human Be-In Poster. The item "Vintage RICK GRIFFIN Poster HUMAN BE-IN Pow Wow 1967 Psychedelic Grateful Dead" is in sale since Monday, June 05, 2017.This item is in the category "Entertainment Memorabilia\Music Memorabilia\Rock & Pop\Artists G\Graham, Bill\Posters". The seller is "blingbot1969" and is located in Los Angeles, California. This item can be shipped to United States.