Original 1st printing 13&7/8 x 21&1/8" concert/event poster for the WCFL Big 10 Radio Summer Music Festival, held at Soldier Field in Chicago, IL on 7/18/1970.
Art by C.A. Nitti, poster lists no performers, but festival participants included: Leon Russell, MC5, the Stooges (with Iggy Pop), Chicago, the Illusion, Funkadelic, Pig Iron, It Doesn't Matter, Happy Day and Bush.
Extra-thin flat index stock poster is in BEAUTIFUL mint/near mint to near mint (A/A- to A-) condition; just a slight curl to the paper from being rolled (it came in the original tube it was distributed in), a whisper of toning and a tiny edge ding or two, otherwise fine.
VERY VERY hard-to-find Chicago-area poster from a semi-obscure radio station-sponsored event, you can read a review of the show HERE;