You know, sometimes I wonder if people have ever had a conversation before...
"So, how has your day/week/summer been?"
"How do you know (party host)?"
"What kind of music do you like?"
"What do you usually do for fun?"
"What's you favorite movie/Have you seen any good ones lately?"
"If you could go on vacation anywhere in the world, where would you go?"
"What do you REALLY want to do when you're older?"
Then, follow up her answers with more questions, like:
You: So, how has your summer been?
Her: Pretty good, I went camping with my family last weekend.
You: Really? Where did you guys go?
Her: We went to (whatever).
You: Oh cool, I hear they have some really nice trails there. (make stuff like this up if you need to)
Her: Yeah they do. We actually got lost on one of them!
You: Haha, too bad I wasn't there, I'm a master navigator! (C+F)
Now maybe that wasn't the world's greatest conversation but you get the idea. Even if the chick is anti-social or something and only gives one-word answers, you can still use this technique:
You: So, how has your summer been?
Her: Good.
You: Only "good"? What have you been doing?
Her: Mostly working.
You: Where do you work?
Etc, etc. Understand now? If you're both drunk that should make things 100x easier.