Here's the Ontario schedule with a couple of Quebec events thrown in... http://www.cat-alist.com/notices/2008/2008_orca_schedule.pdf
The Quebec and ORCA events have a good number of F18 boats doing battle, all are open events, Also listed are a couple of Hobie division events, I did't notice what you are sailing.... And if you want a 3 day long distance race well laid out with campground stops along the way, the Around Prince Edward County is a fun event.