I just heard back from Mr. Silverman. If you are on the high wait list and want to come to the 2nd look on April 26-27 just e-mail the admissions officer and they will send you the necessary paperwork (due 20 April). At least a few high waitlisters are going to be there. There are no other formal events scheduled, but if waitlisters want to come on an individual basis once they get accepted, the admissions office will work with them to set up an itinerary.
I think that I am going to go. It seems a little pathetic since I have not yet been accepted, but I really liked the place during my interview and I want to show that I am serious about attending.