I would have absolutely killed to see the chili peppers around 1989/90
Willo,  I see you're in Newcastle.  Boy did I miss some great bands at the Newcastle Riverside (500 person venue) at the start of the 90's...
Nirvana - Didn't bother going to see them, was sulking because I'd missed Mud Honey.  
Pearl Jam - Didn't realise they were on.  
Black Crows - Didn't know how good they were until after they'd played
Smashing Pumpkins - Got my dates mixed up and missed them.
The Riverside was a fantastic venue, small, sticky carpets, good PA.  It's now sadly, a dance club.  I played there several times in the mid to late 90's.  My favourite back stage graffiti was the Rolf Harris' Rolf Aroo.  :)