Dress as your favorite superhero or villain and rock out to Sláine-inspired project The Horned God, crust / sludge trio Roñoso, Lovecraftian conceptual metal group Shoggoth, unknown entity 10 Ton Hit and self-described “groove metal / progressive sludge” foursome Earth Burnt Black (Greeley, Colo.). Doors swing open at 8 p.m. for this 21-and-up show and admission is four bucks. While it technically doesn't count as a comic costume, Shoggoth might appreciate a few sexy Cthulhus staring back from the audience. (SAC)