The EQT Pittsburgh Three Rivers Regatta offers live music, boat races and plenty of activities for all ages. The fun gets underway today with a performance by Smash Mouth (the purveyors of some of the most dangerously infectious pop music of the '90s) and (*fingers crossed*) a legion of shimmying Shreks. Plus, there's a can't-miss Red Bull-sponsored human-powered flying machine competition. Activities run from 10 a.m. to 10 p.m. today and Sunday.