I replied a few posts back when this thread was thriving a few months ago. There were a couple that I'd forgotten about that are most definitely worth mentioning.
Talking Heads @Orpheum in Boston 1980. The band had recently released their much anticipated 4th album (Remain In Light). Upon listening, it was a complete departure from their previous efforts. The music seemed fairly inaccessible and difficult to get a grip on. It came off as a real disappointment. So a few weeks later I make a few maneuver's and get myself and a friend on the guest list (with no seats). We get this great spot behind what I'd call the Abe Lincoln seats. The band starts out with the original members (as a 4 piece). After a few numbers, they started bring out other musicians. Eventually there were 9 onstage and they started a doing a string of numbers off the new album. They were amazing. I'd equate listening to the record for the first time and then going to see them perform the songs to staring at a Monet from two feet away and then stepping back about 20 feet. Incredible.
This is from a gig in Italy (1980), but it's pretty much the same as the one I attended.
The other was attending both the matinee and evening shows of the last two Clash gigs of the 17 show residence at Bond's Casino in Times Square (June 13, 1981). Scored my tickets on the street for face. I was actually onstage for the last 2 songs of the matinee (with about 100 others). The stage lights were unbearably hot. Amongst the best days in memory.