MIT has a pretty strange setup for sorority rush. There are 5 sororities on campus and here's what we do:
Round 1: The Rho Chi's take their rushee groups to each sorority's rush room for 10 minutes per sorority. Then, sororities hold open houses, and rushees choose which houses to go back to and for how long.
Round 2: Sororities make their first round of cuts. Rushees pick up their invites and choose up to 4 sororities to go to for "informal rush". During informal, a rushee goes to a particular sorority and signs out for x hours (x is limited depending on how many sororities the rushee has kept). This is the only stage of rush that is held outside student center rush rooms. Sororities with houses generally take rushees to the house; sororities without houses take rushees out for coffee, ice cream, etc. Rushees must pay their own way.
Round 2a: theme parties. Rushees can go back to up to 3 sororities... the sororities don't cut before this round.
Round 3 is pref. This is the round where sororities cut heavily. Rushees can go back to up to 2 sororities.
Next day is bid day.
Yes, our rush was really weird. Oh well