Also, I just did this interview day. Here's the breakdown:
Night before:
optional tour and dinner at the Pizza House. I didn't do the tour, but the dinner is extremely casual. They'll kick you out at about 830p so that people go home and get some rest.
The day of:
If you drive, you park in a garage. They have an excellent set of mobile directions that take you straight to admissions. It says be at the garage at 700a for a 730a show at Admissions. It's really about a 15 minute walk, max.
You get a bag of some materials and swag, and they take you to a room for breakfast, a talk from the Admissions director and a few other faculty. Afterward you're split into groups - one half does the MMI, and the other does their long form interviews. The groups then switch. It's all done around 1130a.
Everyone gets back together for lunch with more students. When lunch is over, you do an "untour." You're randomly assigned into groups of about 12, and head to different parts of the hospital to experience something. The 3 groups for my day were sutures, OB, and surgery (which is not too dissimilar from suturing).
When that's done, everyone gets back together for a few more discussions from admissions folks, another chance to talk to students, and more refreshments.
We were done before 330p. Post if anyone as questions, I'll do my best to answer.