I think the email they sent about admit day said it all. It seems like another Open House basically. You go, meet the faculty, listen to information about the programs, and talk to current students I'm guessing. The best reason to go would be to see the campus and start looking at neighborhoods to live in. The only other reason is if you're realllly not sure about which school to go to, and you're the type of person where you go on gut instinct. That happened with me and Georgetown undergrad. Fabulous school, great name, but I visited and it just wasn't for me.