I was wondering that, if classes start on the 8th, can we move in on the 7th?

you move in 4-5 days before classes start, usually on the weekend before classes. It depends on residence.

Sept 3rd and 4th are the move in days for first years.

I've read that move in dates are on the 3rd and 4th
however, I will be on a trip and want to stay as long as possible
so I want to know if I CAN move in on the 7th

I think you need to get special permission. And you'd miss frosh week, which is sort of a one time thing... but its possible.

Originally Posted by wakkydoodle

I've read that move in dates are on the 3rd and 4th
however, I will be on a trip and want to stay as long as possible
so I want to know if I CAN move in on the 7th

It's usually okay if you want to move in a couple of days later. However, after a certain date (TBA) you'd have to fill a late move-in form. I think you'll be okay though. For e.g. last year move in was Sept 5/6, and anyone arriving Sept 10 or later had to fill in the form.
Just to make sure though, email rez admissions: resadmissions@mcmaster.ca

but remember if u move in on the 7th u will be missing all the welcome week stuff
U can always go to trips but welcome week as a frosh happens only once in ur lifetime
think carefully if u really want to stay long for ur trip