Original 1st printing 23 x 14&1/2" silkscreen concert/event poster for a Halloween Party and Costume Ball, featuring appearances by Sylvester & the Hot Band, Clover, the Tubes and the Bourbon Street Irregulars, held at California Hall in San Francisco, CA on 10/31/1972.
 
 Artist unknown/not credited, medium-thin flat index stock silkscreen poster is in good (B) condition; there are tack/nail holes in all four corners, along with a small 1&1/4" crescent-shaped wedge of paper missing from the lower right margin, a couple of tiny edge tears/nicks scattered around the outer margin area, small diagonal corner-tip bends, a bit of light handling wear, a mild amount of toning and a bit of ink spread on the reverse, otherwise OK.

Strange little early-'70's California Hall poster from what looks like a VERY fun event. First one of these I have ever seen.