We have a few events during the first few days of Mich. There's the obligatory matriculation photo and dinner, drinks with your DoS, drinks with your tutor, a freshers pub crawl, a few awesome nights in the Cellar and a freshers' pub/bar quiz.
Sometime during weeks 0-2, you'll probably also have a parents' meal (you're essentially assigned to two 2nd/3rd years who will be your college "parents" along with a few other fresher "siblings"). Your "parents" will usually cook for you/take you out for a meal and you'll all get horrendously drunk (if that's your sort of thing.)
Then there's the CUSU-run freshers' societies fair (where you get the chance to see the HUGE number of university clubs and societies you can join), and a KCSU sports and societies fair with something similar on a college scale.