For me.....
Wings.
Hammersmith Odeon, September 1975.
I've been lucky enough to see some big bands and stars in concert; Michael Jackson, David Bowie; Elton John, BB King - even Gary Glitter but none comes close to the atmosphere and audience participation of the Wings concert.
Everybody in the audience was up and dancing and Paul McCartney was the definitive showman - it was like a private set.
Joy - just sheer joy.