There's definitely no one there on the weekends.
I did a search on mcmaster.ca and I got to
this site. We used to actually have to go to an hour of class for this stuff so I'm not sure. Have you tried asking your friends to see if they have the Science 1A00 course on their WebCT?
If no one has Science 1A00 on their WebCT, they're not going to penalize you in any way. In any case, I would just send an e-mail to
[email protected] and ask about that.
Good luck!