psychgradstud

I received an offer of acceptance to UMich (P&SC) last week. After checking in with the admin staff at the school, it seems that this is just the invitation to recruitment weekend. I have to wait till after visiting the school to receive a formal acceptance letter. Anybody (previous applicants or current students) knows what goes on during recruitment weekend? Is this a second round of interviews? And what are the odds of being formally accepted? Thank you