At our age range, the only thing you need to do to get laid is show up.
No joke man. These girls who go get drunk at these parties GO to GET LAID.
All you have to do is show up, be yourself, and not creep them out - though it must be said that by simply being yourself you will have a HARD time creeping anyone out. That is to say - just let your light shine.
Take positive action dude. Talk to a few chicks, see if you find any you feel you would be able to connect with in bed for a night, and close the deal.
But if you want pheros to accompany you, p74 would do nicely. It’s commonly reported around here to be a social enhancer and a sort of “cool guy” transformer. Though I have had some silghtly different results with it, which I still think would do great at a party. The thread I posted about it a while ago is here: In my deviating experience (p74)