The morning was very informative - introductions, lots of information about curriculum, financial aid, the school, etc., then a tour. Make sure you get to talk to some students during lunch and ask any questions you have. In the afternoon there were three interviews - two with faculty and one with a student. My faculty interviews felt super relaxed - they asked questions but more like they were trying to get to know me, not like they were grilling me. I felt like the student interviewer was trying to put me on the spot a little more, but it still wasn't too bad. Students, faculty, and staff were all very approachable and welcoming of any questions. It sounds like you've done your homework. It will be a great day. Just enjoy it and be yourself!