25 March 1966, the Jefferson Airplane and the Mystery Trend played a "rock & roll dance benefit" in support of the Vietnam Day Committee. Costing $1.50 to get in, the "peace trip" was held at Harmon Gym, on the campus of the University of California at Berkeley - the institution that, after Mario Savio's December 1964 "put your bodies on the gears" speech, had become the centre of American student radicalism, in particular the protests against the escalating Vietnam war.
The event was one of several "peace rock" benefits held in the gym that spring that cemented the link between the politicos of Berkeley and the bohemians of the nascent San Franciscan music scene: others showcased the Grateful Dead, the Great Society, and the (original) Charlatans. Citing one of these shows, the columnist Ralph Gleason observed that the city was "on the verge of another dancing craze" such as had not happened "since the swing era". Nothing apparently untoward there.