<p>Why not? Email the professor you’d like to meet with on your visit, with plenty of lead time, and inquire if they’d be available to meet with you briefly (and you might want to say something that might convince them it was a good use of their time to meet with you: why you’re interested, etc.). If they say no or don’t reply, the answer is probably no. But you won’t know unless you ask. (If you meant does the Admissons Staff arrange meetings with professors for you, I think the answer is no. As I recall, during the term there are lists of classes available to sit in on, though, so you may be able to talk briefly with a professor after sitting in on their class.)</p>