[DubaiSis]

The only applicable school can be Appalachian State. I tried to get a gauge of if they would be doing a significant informal rush based on previous numbers, but didn't have enough data.

I'll take a leap and presume they ARE doing informal and the OP is preparing to attend an event. So, to answer THAT question, go in dressed nice while appropriate to the event. If jeans and a sweater are the right outfit, just make sure you are polished, good shoes, cute accessories, good hair and makeup (but this isn't the Miss America pageant; no need to spackle on the makeup), etc. Go in prepared to be friendly, open, forthright and charming. Smile, answer questions in full sentences, and don't hog the conversation, especially if you are in a group of other rushees with a smaller number of sorority members. A great piece of advice I read here long ago is go in with 3 stories in your back pocket that share something about you and highlight your awesomeness without being arrogant. Another concept to think about is the "elevator pitch." In the sales world, we all work on a 30 second spiel (the approximate time it takes to ride an elevator with a stranger) that describes what we do and why you should buy from me. You will be asked a myriad of times some variation of who are you and why should we pledge you? That will come out as What's your major, what's your home town, what did you do last summer... but the question behind the question is Who are you and why should we pledge you. Good luck!