So what is the earliest concert you can remember going to

I also saw James Taylor and Bonnie Raitt at the Mann that same Summer. Another great small venue.

Seeing Genesis, the Stones and The Who at Vets stadium were all great Concerts...but not as much fun as the small venues were. Billy Joel at the Spectrum was fun too, but give me the Tower or the Mann anytime.
Keswick Theatre, Ripleys, Chestnut Cabaret, Empire Rock Club...