The interviewer does not sit on the admissions committee. S/he mearly writes a letter of recommendation on your behalf based on the time you spent with him/her. With the exception of two short presentations, the rest of the day is up to you. You can talk to current students, sit in on classes, take a self-guided your of the hospital, speak to anyone of the faculty members, or anything else you may want to do. Vandy also has a host program. Be sure to check out the web site for information on staying with a current student.