There were some posts in the past about an attempted get together for a wash and wax day. I think that fell apart though.
There's usually something for the Gran Prix... or is that no longer an option (I don't follow F1 enough to remember if Montreal is still on the calendar or not).
If you're willing to drive south, there's a group of whackos in the greater Boston area, and sometimes they do stuff north of Boston... check out
http://www.mini-mama.org/
There are a handful of northern Vermont (Burlington area) MINI owners around, we could make an international group...