Are you heading over to sorority houses Tue or Panhellenic? If you are goin to Panhellenic, ask which chapters are holding events. Ask about how this process differs from formal recruitment, right on down to attire.
At the sorority houses-- Just like in formal recruitment, ask all the same questions and talk about your assets, just as you would have for a formal recruitment party. If you are warming up to a chapter, tell them that you like them, you feel comfortable, you really admire their sisterhood, etc. Don't be afraid to talk about your talents and attributes that make you an outstanding prospective member-- your performing talents, that you will be in school another 3 years, GPA, your unique experiences, etc.
Best of luck!
Pi Love and Mine