Let's just deal with the architectural logistics of this first: there's an open basement space below that they somehow brought to the event with them; and in this basement space there is a tumulus that the staircase continues down into. And in that tumulus, sitting in a coffin and looking kinda lonely, is, in fact, a DJ. Also he's a vampire (I should probably have lead with that, though you probably figured it out already). The vampire would love to DJ for your party, he says, but he can't possibly leave right now as he doesn't have a vampire date to bring with and that would be a major faux pas. Ignoring how the vampire even got into this situation, you quickly suggest...