Original 1st printing 13&1/2 x 18&1/8" event/concert poster for "Fluxfest", a multi-act show/happening held at Longshoreman's Hall in San Francisco, CA on 3/31/1967. 

 Poster lists performances/appearances by Quicksilver Messenger Service, the Wildflower, the San Francisco Mime Troupe and more.

 Art by Ida Griffin, medium flat index stock poster is in near mint to excellent (A-/B+ to B+) condition; just a trace of surface dirt/light smudging and a tiny edge ding or two lurking around the outer margin area and a thin vertical stress bend just above the "n" of "Longshoreman", otherwise it is an absolutely GORGEOUS example of this semi-obscure 1967 SF event poster.