Party

Right now im interested in this girl and tonight is her birthday. I am taking her out tomorrow, but the thing is i was invited to this party tonight (completely different occasion). She told me to go, but she doesnt know that this girl tahts hosting this party also likes me. Im not sure if i want to go because when you drink shit happens. And i really like this girl. I wouldnt want to do anything in a drunken state that could hurt my chances. What would you guys do and dont say go and not drink because thats out of the question. Either go and drink and hope for the best or dont go at all. Which one???????