I see that Cheap Trick and The Tubes(and about 100,000 other bands) are playing this weekend at the Darrington Ampitheatre- http://www.darringtonamphitheatre.com/- looks to be about about 90 miles from the Convention site.
Cheap Trick is on at 10 tonight(Fri 8/4) and The Tubes are on at 5pm- !?!- tomorrow.