The Monkees 1987 and 1996 (I met Peter Tork after the '96 concert-- he was a sweetheart!!)
Stone Temple Pilots, 1996
Tori Amos, 1997 and 1998 ('97 was just her, a piano, and a harpsichord; '98 was plugged)
"Ska-lloween" 1997 at my university featured, among others, Save Ferris and The Toasters
Weird Al Yankovic, 2000
The Wiggles, 2006 and 2007 (I'd like to be cool and say my tiny kiddos were the only ones who enjoyed this, but... that would be untrue, haha. I was singing and dancing along with them, and one of the Wiggles saw me in '07 and started laughing onstage. XD)
I don't get to concerts very often.