Can't stop thinking about this thread now, and 3 "honourable mentions" for best gig which were David Bowie at Avery Hill College just before Hunky Dory came out and Lou Reed at Imperial College at the time of Rock and Roll Animal and a coherent Bob Dylan at a small ballroom in Miami in 1998
First Gig - Rolling Stones on Hastings Pier sometime in the 1960's
Worst Gig - Sham 69 at the Roxy - they were just awful, must've been their 1st or 2nd gig
Can't be topped - Bruce Springsteen at Hammersmith Odeon in 1975 I think - complete eye opener, amazing gig.