Rarely seen poster from the event.

This is the very first of its kind outdoor festival, running Sat. and Sun. from 10:00 a.m.- 6:00 p.m., with all the top local bands helping usher in the dawning of the 1960's rock festivals. The Monterey Pop Festival is next week and far outshines this one but this is the first! The Doors play a good strong set with Jim swinging off a few flag poles while playing the crowd rather effectively in such a hectic atmosphere with 15,000 in attendance. The Doors also play the Fillmore Auditorium later tonight. Also performing: (either Sat. or Sun.) The Jefferson Airplane, The Fifth Dimension, Dionne Warwick, Canned Heat, The Byrds, and The Steve Miller Band just to name a few.

Review: "It was a weekend of the Big Blast on Mt. Tam. It was wild sounds and wild colors, sky-divers and side shows, bizarre hippies from the Haight Ashbury and T-shirted fraternity boys from Cal., young people necking on the sunburnt slopes and children sitting wide-eyed in a real tepee, Hell's Angels munching peanut butter sandwiches at a health bar...there was something for everybody." (Maitland Zane, "Bash on Mt. Tam," San Francisco Chronicle, June 12, 1967)