Official (promoter-issued) 2nd printing 14&1/8 x 20&1/2" concert poster for Bo Diddley appearing with Big Brother & the Holding Company (featuring Janis Joplin) at the Avalon Ballroom in San Francisco, CA from 8/12-13/1966.
 
 Art by Mouse/Kelley, image ("EARTHQUAKE") is # 21 in the Family Dog/Avalon series.
 
Medium flat index stock poster is in excellent (B+) condition; just a tiny pin-prick spot just beneath the "Q" of "EARTHQUAKE", along with a few very light creases/soft bends hiding within the image area and a bit of minor creasing wear along the right margin, otherwise fine.
 Please check our other listings for more original posters, handbills, and other music memorabilia.  We are always getting new inventory so please feel free to send us your want lists.  
 
Thanks for looking!