This sounds like fun. You get to go around the room putting your key in their locks, so you get to talk to everybody. I would go over to the people I find most attractive first, when they are not talking to any other guys. Say "Hi, can I try your lock?" If it doesn't work say "Too bad". If she says anything that seems like she wants to talk to you at all, chat for a few minutes. Then excuse yourself and keep trying more locks. When you find your matching lock. Ask for her number regardless because "you must be a good match ha ha". Don't spend all night talking with only one woman. Talk to at least 4. Go back to the few who you had good conversations with and ask for their numbers and give them your business card. Have fun, playa!