When I went to the UW interview, there was a thing the night before that was optional. it was ok...didn't learn any earth-shattering info, but it also answered some questions and gave some additional info about the schedule and stuff for the next day. kinda helpful. the interview day itself was pretty relaxed...there were some speakers (financial aid, director of admissions, an adcom guy, important director-type guy from the hospital). then was the interview and then the tour (i think it was in that order...been a while). really relaxed the whole time. UW had 2 interviews...the first was with a doctor and is your traditional, open-file interview. pretty relaxed. but the 2nd one was like a small-group interview....it was maybe 3 or 4 applicants with 2 medstudents...really odd. i don't know what to do in that situation cause i didn't want to talk too much or not enough...conversation really seemed forced for everyone there. just a warning. but yeah, prep for the UW interview day like you would for anywhere else and don't get too stressed. it was really relaxed. i liked UW a lot.