Between 1978 and 1984 I think I saw all the notable bands from the punk and new wave era (certainly every one that has been mentioned in this thread).

If there was a band that I wish I’d seen that I know now I can’t it would be The Beatles (but wouldn’t 95%+ of people say that). I’d add Lou Reed to the list and Joy Division (who I still can’t believe I missed)

There is only one gig I MUST see now and I know I’m prepared to pay almost whatever it takes and that’s Bruce Springsteen and The E Street band (sadly without Clarence so not sure it truly counts). I’ve seen Bruce on his own but not with the band