Foo Fighters returned to the stage on Sunday night at Napa Valley's fifth annual BottleRock Festival, their first U.S. concert in almost two years. (Not counting the secretive 150-capacity warm-up gig just prior.) Apparently there was a 10 p.m. curfew, though, and the group had to face a salty plug-puller when their sound got cut during the 1997 classic "Everlong."