Original 1st printing 14&1/8 x 20" concert poster for Howlin' Wolf with Big Brother & the Holding Company (featuring Janis Joplin) appearing at the Avalon Ballroom in San Francisco, CA on 9/23-24/1966 (*show canceled). Art by Stanley Mouse & Alton Kelley, image is # 27 in the Family Dog/Avalon series. Medium-thick flat vellum stock poster is in excellent to near mint (B+ to A-/B+) condition; a pair of ultra-soft bends in the bottom corners and extreme top/left margins and the slightest hint of age spotting in the lower right corner, otherwise a GORGEOUS example of this classic Mouse/Kelley Family Dog image with particularly strong/rich colors.