When you’re on top of the local beer game, you don’t just celebrate with a few special brews at your taproom. Instead, you throw a concert. And that’s what Fieldwork Brewing Company in Berkeley will do to mark its second anniversary of making some of the tastiest beer on the West Coast. Headlining its bday party will be The Brothers Comatose, the S.F.-based Americana troupe. Expect enough banjo, mandolin, and fiddle to make your hazy beer clear. Also on the bill are duo Goodnight, Texas, Wisconsin outfit Horseshoes and Hand Grenades, and Ghost of Paul Revere.