Original 1st printing 16&3/8 x 11" benefit concert poster (for Northeast Mental Health Center of San Francisco), held at California Hall in San Francisco, CA on 5/20/19?? (no day of the week OR performers listed- unknown who appeared)
 
 Artist unknown/not credited ("Mr. Natural" courtesy of R. Crumb), medium flat vellum stock poster is in good to very good (B to B/B+) condition; there is a hand-written (in blue ballpoint pen) annotation ("Beer", with a small arrow coming from the word "drinks") in the center of the poster, along with a few stray thin edge bends/minor creases, light handling wear, a few light fingerprint smudges and tiny edge dings here and there, otherwise fine.

MEGA-OBSCURE oddball California Hall poster, I wish I could find out more information about the show!