Laurie,
The first thing you should do is contact the Panhellenic or Greek Life office on your chosen campus. You will need to register for Recruitment NOW. In the materials they will send you will be an application and suggestions for dress during the week.
If you do not know any sorority alumnae to write a recommendation, don't worry about it. It is the responsibility of the chapter, not the prospective member, to secure recommendations or letters of introduction.
As far as the Recruitment events go...just relax, have fun and be yourself. Ask questions about the chapter, their events, scholarship standing, activities on campus, etc. I have a Recruitment web page that answers the most basic questions and applies to all campuses:
http://panhellenic.tripod.com/FAQ.html
Good luck!
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Fraternally,
Barbara
Zeta Tau Alpha Alumna
If you have to go around telling everyone you're in charge you're not much of a leader.