Original 1st printing 8&1/2 x 11" concert flyer for "Sun Fun Day", a multi-act show featuring the J.Geils Band appearing with Poco, Doug Kershaw (with Slidin' Jake), Muddy Waters and Chilliwack at Titan Stadium on the campus of the University of Wisconsin in Oshkosh, WI on 6/5/1977. 

 Designer unknown/not credited, thin flat stock flyer is in VERY sharp mint/near mint to near mint (A/A- to A-) condition; an unblemished example of this obscure Midwestern concert flyer with a nice design.