Think I'm a little younger then some here.
For me "The Red Hot Chili Peppers" was a big band to see live in the early 90's.
They played a small venue in Rode Island around 91, they had 2 opening bands with them. First was Smashing Pumpkins (before Siamese Dream came out) fallowed up with Pearl Jam (before 10 came out). Think tickets were like $25
It was almost a 4hr show, I remember being beside myself the entire time. On the following Monday went to 3 different record stores to get Smashing Pumpkins and Peal Jams records. Only to be told, they have no idea who those bands are, there are no records to sell.
The second life changing event for me was Lalapalooza also think it was 1991, saw almost every band I loved, including Nine Inch Nails, Butthole Surfers, and Jane's addiction. That was an incredible day, no other festival has come close.