The Baltimore Rock Opera Society and Single Carrot Theater team up to put on the most ridiculous Halloween party they could, and the theme is butts. Two bars serve delectable drinks, and two stages are ready for BROS featurettes and bands like Adam Lempel and the Heartbeats, Slow Jerks, and more. Come dressed in your finest get-up; go all out, because there's a costume contest for people whose costumes match the theme.