Months of planning went into El Rio’s annual Halloween party, where this year, the feature creature is… you! Indeed, the calls to party are coming from inside the house, where four DJs will stalk two dance floors, drag performers flaunt their high holiday finery, and performance artists pop up to trigger all your phobias. This is a party for queers and their allies, so leave your lazy, unwoke costumes at home — the theme is nightmares and everybody has one of those, so get creative.