The flight was not paid for, but we got two nights in a hotel (shared w/ another applciant) which was cool. They told us to get there pretty early on Wednesday, but then they just gave us dessert that night. I guess it wasn't all that bad since I got to go around downtown Chicago.
There was 6 interviews and the meeting with Dr. Engman. 3 interviews were at the medical school and 3 were at the other campus in Evanston. It seems that the school just picks a number of interviewers for the day and matches each applicant to the ones they picked as best as they could. Alot of us ended up with people who did things we had no interest in. Then there was the panel interview, with other MD/PhD students, but really, just be yourself, it's not bad.