There are two groups, one begins the day earlier, one begins the day later - I was in the later group. In the later group, we took a guided tour of Detroit (in a bus), had lunch with current medical students, took a tour of the medical school, and then took photos to be used as ID photo should we receive an accepted. After photos we were transported by bus to another building in which the interviews were to be held. There are three components to the interview - MMI (30 minutes), student interview (30 minutes), and faculty interview (up to 60 minutes). We were split into three groups, that rotated through the different types of interviews in different orders. For example I did student interview --> MMI --> faculty interview. Then we got back on the bus and were transported back to Mazurek where we were dismissed. If I remember correctly we were dismissed by ~3:30pm.
To my understanding the difference between the earlier and later group is that the early group does the interview first, and then the tours etc whereas the later group does the interview last.