If you look at the calendar (
http://www-athrec.mcmaster.ca/intram...l_calendar.p df), it will tell you when you can register. Some sports are offered in the fall, others in the winter. I do not know of any sports that are offered in both; you'd have to check the calendar. If you want to sign up for a winter sport, follow the calendar for registration dates. You do not sign up for all sports at the "beginning".
DannyV,
There is a possibility that they still haven't posted the game date I guess. What sport are you?