<p>UChicago- in #71 you mention looking at timeschedules.uchicago.edu for classes to visit. My D will be attending one of the accepted students days where they have the ability to attend up to 2 classes. Will these classes be only for a predetermined subset or will they be able to find a class from the site above which interests them? What is the procedure to attend, should they get permission from the professor ahead of time? if the room shows not to be at capacity is that a good indication that a visit would be allowed?</p>