dude, girls are people too... not some alien race. You talk about whatever.
But if you want some advice. Ask her what shes interested in and see if you have any common ones. If you don't, thats ok, ask her what she likes about it. You can also talk about whats going on around you at the moment. For example, you see some guy making a complete idiot of himself on the dance floor... point it out and have a good chuckle about. comment on the cheezy decorations. Compliment your date on how she looks. If you guys are compatible... conversation should come naturally.
Don't get too frustrated if it doesn't. There are just some people you can't talk to... it happens to everyone.