Is it the same as Term 1 courses? Or is it March like Term 2?

same time as term 1 courses

It depends what sort of "dropping" you mean. To drop without financial penalty, it's the same day as term 1 courses (Sept 13 this year), but to drop without academic penalty it's the same as the date in term 2 (March 14 this year).

The registrar has all of this info online: http://registrar.mcmaster.ca /regis...sessional.html