My campus also has only four sororities, and we don't do ranking until the last night either. The first two nights, all PNM's attend all parties, and then the third night, they attend up to three, and the fourth night up to two.
On the day of the third parties, the PNM's go to the Student Life Office at a certain time and see where they were invited back...If there are more than 3 that invite them back, they chose one not to attend and the same thing on the fourth night. There is no ranking until after Pref night.
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