LIKE JELLY ROLL | The second of three nights of jam-style shows, the singers CHRIS BARRON (of the Spin Doctors) and JOHN POPPER (of Blues Traveler) get loose with several combinations of local musicians on two Portland stages. The first comes at the Big Easy, where the two are supported by the band the SHAKES (7 pm, $12 at 55 Market St., 207.775.2266), while the second, supported by the FOGCUTTERS, JASON SPOONER BAND, and several other players, goes down at Port City Music Hall at 9-ish. That one’s $20. The whole three day endeavor’s being dubbed the F.O.G. Festival. See our listings for even more.