Hippie heaven.

January 14, 1967 ~ Upwards of 25,000 people turn up at Golden Gate Park for “A Gathering of the Tribes for a Human Be-In” – a prelude to the Summer of Love.

Just about every counter-culture group is represented — hippies, beatniks, Hells Angels taking Timothy Leary’s admonitions to heart. His famous “turn on, tune in, drop out” is born at the be-in, a play on the “sit-in” response by students to the Viet Nam war and civil rights issues.

The Steve Miller Band, Santana, The Grateful Dead, Big Brother and The Holding Company and Jefferson Airplane play the 6 hour event.