Original 1st printing 8&1/2 x 11" concert flyer for the Jim Kweskin Jug Band (with Maria Muldaur) appearing with Big Brother & the Holding Company (featuring Janis Joplin) and the Electric Train at the Avalon Ballroom in San Francisco, CA on 10/7-8/1966.
Art by Alton Kelley and Stanley Mouse, image is # 29 in the Family Dog/Avalon series, this is the blue border/green hair version (OHB-B in the Eric King guide).
Thin flat stock flyer is in good (B/B-) condition; light to moderate toning, pin/tack holes with a couple of light pulls in the corners, a bit of softening/fraying in the bottom right corner, a few soft edge dings along the right margin, a little bit of light moisture rippling/handling in the top center and a few stray pinch dings/tiny stress bends scattered here and there, otherwise fine.
Very decent-looking example of this ORIGINAL 1966 Janis Joplin concert item from the Avalon.