I've never heard of classes being cancelled before, but this is the first year that purchase of a MacPass has been mandatory. Seems highly unlikely though that they would cancel them. Of course, you can always skip them - this is totally up to you. There are people who will tell you you should or you shouldn't, but really, it's up to you.
They provide buses back to campus, but the locations and times and everything are apparently on the welcome week events app - I don't understand why they can't just make everything easily accessible online rather than just saying to check the app