I don't know if Pomona is the same as Lebanon. But in Lebanon, it is a long day 8:45 to 4:00.
Tomorrow (9/29) is the first interview day in Lebanon, so nobody knows the questions that will be asked. But know the answers to "Why doctor?" "Why DO?" "Why COMP?" "Why should they accept you?" also, know your application well and be able to answer questions about it. At least one person on the interview panel will know your application well, and they will have focused questions for you.
Also, look here
http://studentdoctor.net/schools/school/wuhs-nw/survey/26
go down and click on the "questions" bar to see questions that were asked in the past.
Two (or three) on one interview. also 2 or 3 stations of MMI.
Also a tour, OMM/OPP demonstration, maybe anatomy lab tour.
Lunch with students, and all sorts of stuff. I tried to find the agenda, but could not locate it.
Look at
http://prospective.westernu.edu/osteopathic-northwest/interview
DISCLAMER: again, I want to stress that this if for the NW campus in Lebanon, Oregon.
The interview day in Pomona may be different.
I have prepared a short (1-2 minute) introduction that includes the answers to many of the "Why..." questions that I listed above. I sort of sounds cheesy, but I explain why I have waited so long to apply to medical school (I am VERY old compared to many of you that are applying), How I changed from being a teacher to wanting to be a doctor, and how medicine and education are actually very similar. Some of my strengths, and some things that I know will be a problem, and how I plan on working with those problems so they are not going to be problems.
HTH
dsoz