The first thing to understand is that IPSC-ON does not run the BB courses. The courses are run by independent instructors, IPSC approves of the instructors and accepts your completion of one of their courses as your "price of entry" into IPSC.
Each instructor usually works their local geography, working with local IPSC clubs to schedule and run BB courses. There are only a limited number of authorized instructors in Ontario, so supply is fairly tight.
As Dexter said, start checking with local clubs to see if they are aware of any upcoming courses, this will be much more effective than trying to get the info via IPSC-ON. Also remember there are not very many indoor ranges that have an IPSC section that also run courses in the winter. In Eastern Ontario, there is currently only one instructor that I know of and his courses fill up pretty quickly just by word of mouth.
ckc123: if you PM me your location, I can give you the list of local clubs to contact if you like.