Charlottesville’s Indecision is one of those ’80s party bands that’s played with everyone on the jam scene — Dave Matthews, Phish, Widespread Panic, the Neville Brothers, even groups like the Feelies. With an upside-down mushroom for a logo (I think that means it’s pro-golfing) the group is known for crowd-friendly, danceable blues-rock in the vein of Little Feat, the Bonzo Dog Band, Allman Brothers and other ’70s favorites. In its heyday, Indecision filled local venues such as New Horizons Café with writhing bodies, Guatemalan pouches and dilated pupils. And since its last studio release in 2004, the band has kept going (30-plus years now) out of sheer love for playing live. The band’s rare shows are self-assured affairs featuring its Southern-tinged originals (“All I Need,” “Marcus Lane”) intermixed with popular covers (Beatles’ “Dear Prudence,” Dave Brubeck’s “Take Five”). Indecision plays the Camel on Saturday, Dec. 26, with tickets running $15-$20. In related news, jam banders can keep their buzz going into the week when the nation’s best Grateful Dead tribute act, Dark Star Orchestra, sets up camp for two nights at the National on Dec. 28 and 29.