Bowen was the co-founder of the San Francisco Oracle underground newspaper along with Allen Cohen. They had previously organised the Love Pageant Rally to protest a new law banning LSD, which also provided the central theme for the Human Be-In. The pair contacted Berkeley radicals such as Jerry Rubin and Max Scheer, as well as a number of rock bands, beat poets and other counter-cultural figures.
The event itself provided worldwide media exposure to the emerging hippie movement. Connections to the earlier “Beat Generation” were provided by the poets Allen Ginsberg and Lawrence Ferlinghetti. The Hells Angels provided security and a group called the Diggers handed out food. The psychologist, Dr Timothy Leary, suggested that everyone “Turn on, tune in, drop out”; while, Owsley Stanley distributed his “White Lightning” LSD. Music was provided by Jefferson Airplane, the Grateful Dead, and Quicksilver Messenger Service.