….???
This is the Black Party we're talking about, not a normal club.....???
99% of the population will be in tight leather underwear and a chest-harness.
You don't really need to say or do anything. Honestly, just dance and let your body do the talking. If you like someone, go next to them and start dancing - they're probably doped up on something anyways. If they're not feeling it, move on, but if they're feeling it, they'd either grab you at some body part or something along those lines.
Black Party's quality has degraded over the years, and last year was just atrocious... No theatrical value whatsoever (lights), backroom was wayyyy too crowded, the drinks were simply vomit-inducing. I no longer recommend it.