I called admissions, they do have a date picked for the admitted students event. However, they are not giving it out. They were very kind on the phone. They said, "All we can tell you is it will be on a weekend in the beginning of April."
My guess is April 5th or 6th. I really think they will get the emails out soon because people need time to make travel plans for the event.
I don't know why they aren't releasing the exact date. Maybe, they've had disgruntled rejected applicants crash it in the past.