It depends on how many people you already know are going to be there.
If you know a lot of the people going then it isn't necessary and you can focus on meeting girls there through the others, the people you already know will also act as your social proof and will probably know other girls that they can then introduce to you.
If you don't really know that many people, then bring a friend. It fulfils two purposes, one is that you actually have somebody there you know haha, the other is that it will provide you with social proof, especially if she is hot. Girls, especially college aged girls, have this tendency to wonder why a guy is talking to and hanging around with a hot girl. If you're standing around chilling with a good looking girl, the others will notice, and think there must be something about you, why else would you be talking to this girl.
Just an idea
Gunner