Hi Stewart,
Also just to let you know we are having an informal F18 trailing weekend near Toronto in early May. (small inland lake so the water will be wwwarmm).

We also have a pretty active group in ontario.. The fleet here is just getting up to speed on F18s..we should have 15 boats here in 2007. There are a couple of great regattas in Burlington, Ontario..shouldn't be too far a drive for you.
You can find the combined Ontario/Quebec/NY schedule at:

http://www.cat-alist.com/notices/2007/2007_orca_schedule.htm

ORCA schedule
(I think that this is all of the events..)
Dave