Not sure where you're looking but they've only even opened up the registration for the first weekend so far. Should still be able to register for sunday if you wanted. Registration link is here: SASC Winter Driver Training info on Jan 4, 2015 (120672) | MotorsportReg.comI just looked it up, it's already fully booked
Wish I had heard of this sooner.
Beyond thread about this years event is here.
2014-15 SASC Winter Driver Training - Beyond.ca - Car Forums
I'm pretty stoked for Sundays event.