Someone told me there's also a frosh week in 2nd semester.. so when is all that crap done?

http://lmgtfy.com/?q=mcmaster+term+2+st art

There is frost week, not frosh week.

Classes start on Mon Jan 5. Frost week events are happening at the same time as classes are going on, it's not like frosh week where events take place a few days before classes begin.

Is after the 1st term a valid answer? lol
Frost week is in no way as large as frosh in terms of faculty organized events across campus, i mean it is kinda fucking cold out there! Most students tend to make it a drink fest similar to frosh week tho, and RIGHTFULLY SO!!!