My d successfully auditioned into Ball State's BFA in MT last year (and now is a student there). From a parent's perspective, I remember that current students were available throughout the day, and were helpful in answering questions. In the morning, kids and parents were together through a short departmental meeting and demo by current students, then when the prospectives were whisked away to get to work, there was a Q & A for parents (and we asked lots of hard questions, which the students handled well!) and time to relax. As a parent, I think yours can feel free to ask any of the students if they have time to do a quick walkaround of the theatre buildings or even campus with them (I always found those more informative to an MT prospect than the packaged "look at our [insert cool science building here]" tours.)
I would also recommend that you and your family find time for a meal on campus (Woodworth dining hall is the closest to the theatre departments, I believe). The food is impressive (my d is still happy with the choices...and she's a picky vegetarian) and they are welcoming of anyone who wishes to come to eat there. It's quite affordable, too and you can get sort of a feel for "what if I came here?"
Good luck on your audition(s). PM me if you have further questions.