Just had a look at the loads for later on in the month (24th and 30th) and they look pretty good for non revs right now. Keep in mind there are alot of A/C that commute on that route and can fill planes up quite quickly. Having said that, there are flights pretty much every hour so I cant see you having too much trouble getting there and back.
Sorry I don't have the number for non-revs listing at Air Canada..
Hope that helps,
BC