In the meantime, outside in Harvard Square, Jim's Big Ego's free CD release show is supposed to start around 8pm. I hear they're setting up right now, at that little park with the "Newtowne Market" stone, facing JFK Street between Grendel's Den and Peet's Coffee and Tea.
Whichever of those two you go to, when they're over you can head down to The Western Front (343 Western Ave, Cambridge MA) to see the fabulous marimba rock band FLUTTR. Their set is scheduled for 10pm. FLUTTR is one of my favorite Boston bands ever, with Vessela Stoyanova on electric marimba and her musical partner Troy on guitar. They've also got an electric cello.