Don't stress too much. The MMI goes by very quickly once you get the hang of it, and is much more interesting than a traditional interview. The rest of the day is informative and relaxed (very friendly students and admissions staff, plus lots of candy!) Good luck!
I have a question for accepted or current students who did a revisit day (or current students who have seen students on revisits). What are applicants supposed to wear? I'm shadowing a physician part of the day and hanging out with students the rest of the day. A suit seems like a little much, but I want to err on the side of caution. Any insight? Slacks and a button down? (I'm a girl). Thanks