I have an idea, why don't you leave? If you want to study - go to the library. That way you won't be worried about the phone ringing and you can study. In a way, you'll be removing yourself from the stress. Then, when you get finished studying, you can go home and check messages.
Okay, Its 8PM here. I think its quite safe to say I did not recieve a bid.
It would have been nice for them to at least let us know what was going on, rather than just have a party and never get back with you. That makes it more like a bad date rather than a sorority informal.