How bout'  The Sparks, Roxy Music and Be Bop Deluxe at The Higganum  Music 
Hall in Higganum, Ct. in 1976?
Yep, I was there with my "older" friend who wouold take me along to  concerts.
It was mind blowing and so was Mott The Hoople & Queen at The Palace  
Theatre, May 4th 1974.
M