Interesting question. Can't remember all.
I live in N. Virginia now, so Wolftrap, the Birchmere, Capital One Hall, some place at George Mason University, small local places (Jammin Java anyone?) A lot of places on the list I haven't been to yet.
Used to live in Pittsburgh, so the old Civic Arena, Carnegie Music Hall, Heinz Hall, Benedum Center, Byham theater, Star Lake amphitheater (or whatever they are calling it now), Jergels
Grew up in Cleveland so the Richfield coliseum (don't think its there any more?), The Agora, Severance Hall, Blossom Music Center, local bars near my college
I've been to the Boston Symphony in their hall