Chicago/Kellogg school visit?

I have to go to Chicago next month for a couple of days, and I plan to take a couple of extra days off and make a couple of school visits. This will be the first time I visit a school, so any advice on what I should expect/questions I should ask, are welcome.
 
I am planning to spend a day each at Kellogg and Univ of Chicago. Chicago being one of my two top choices, want to take the time to soak in the atmosphere. Fall is a wonderful time to visit Chicago. The only sad thing will be if I get a ding, it will be even more devastating after having tasted what could be.
 
Tentatively the date will be around the 20th of August, will definitely post impressions here after getting back.