Sometimes applicants are invited to a dinner the night before interviews or optional drinks after. I strongly recommend attending these social engagements if you are able. This is your opportunity to demonstrate interest in the institution, gather information you might not get otherwise and highlight your social skills. One caveat: Even if you are told you can say/ask anything at these events without effect on your candidacy keep your guard up and watch what you say and do.
For one-on-one mock interviews contact me at http://www.insidermedicaladmissions.com/ . I am scheduling up to two weeks in advance so please get in touch with me soon.