We do the first round like this at Maryland. The first round takes place over 2 days, and PNMs see 7 chapters each day. Seven chapters rent rooms in the Union the first day, and the other seven rent the rooms the second day. The PNMs are broken into 3 "shifts" for round 1, approximately 8-12, 12-4, and 4-8. Each chapter hosts 21 parties, 7 for each shift. Since only a fixed number of actives are allowed to be in the room, this system allows chapters to switch actives in and out so no one (except the President, VP Recruitment, and appropriate advisors) has to be there for 12 hours. (Or a chapter can choose to keep the same 30 or so pretty girls there all day
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