Glad to hear the first date went... well, I don't know if it went "well" or not since you didn't really elaborate. But she showed up so... yaaaaaay! :cheer:
Now, before you completely screw this thing up, a few things:
1. Today is Wednesday. So trying to see her again on Friday or Saturday is NOT going to help you. Weekend dates shouldn't even be a thought in your head when you first start going out with a girl - subconsciously, those days are reserved for when you're a couple and she knows it. You ask her out on those days too soon and she'll start flaking on you.
2. You're in college - dinner/movies are ok for dates, but try to do something a bit more fun if you can. If you're in a traditional college town there should be tons of things to do in your area; if you're not in one of those towns, at least try to make "traditional" dates interest - like dinner at a Hibachi grill or a drive in movie.
3. NEVER ASK A GIRL YOU JUST MET TO GO TO A PARTY WITH YOU. That's something you would do if you were trying to be her friend; if you're trying to date her you take her out on actual DATES. You also don't take her places this early on where your friends will be - she's not completely sold on you yet (that's what the dates are for), so her being distracted or becoming interested in someone else she sees at these parties is very possible. Plus, if your friends end up being jerks (even though you may not see them this way) or acting weird, she may associate their behavior with how you REALLY act when she's not around. Wait til she's sold on you to take her to these types of things.
4. To answer your "gauging attraction" question:
- If she says "yes" to you every time she asks you out, she's attracted
- If she initiates touching (shoulder, arm, waist, etc.), she's attracted
- If she stares at you for more than 5 seconds when you're talking to her, she's attracted
- If you attempt to go 4 days without calling/texting her and SHE initiates a message/call to you, she's attracted
- If she asks you "so, are you seeing anyone else?", she's attracted
- If, at the end of the 2nd date, you go in for the kiss and she kisses you back, she's attracted
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