I went to the whole Friday event for my interview and I really enjoyed it. The rounds aren't particularly insightful beyond seeing the hospital and how they conduct their rounds on that unit, and your experience will be highly dependent on which unit you get to go with. I was in GI and they do table rounds so we just sat in a room and listened to them talk about patients, so not super insightful. However, the rest of the Friday program was great. Compared to other schools I've interviewed at, I feel like UTSW gave me the most amount of information, and I have a really good idea of what to expect should I get accepted, which was mainly due to the various information sessions on Friday. If you're interested in getting more info than the curriculum overview and campus tour they do on the day of the interview, then sign up for Friday, but I don't think you'd be missing out on anything if that's all you're looking for.