Your police/cop OC has been told about an underground (literally) club run by an unknown person

They see Midnight up at the DJ booth, playing mostly 6arelyHuman. She leaves it playing to take a break in the back room. Artemis is seen bartending, a large, muscular man was at the door, but let your OC in after being told who your OC is. There’s a tall, thinner man also bartending. Who does your OC talk to first?