Do you have somewhere for folks to pee? If "yes", you qualify to host a get-together.

Seriously... all that's required is an open door an the willingness to put up with an unpredictable number of gearheads for a few hours. There's no set format. Hosts can provide food and/or refreshments, or it can be pot-luck, or a mix of both. Someone usually starts a discussion thread a week or two in advance to hash out the details.
Given some of the locations of past GTGs, I doubt that the Gatineau Hills or a short run of gravel would be an obstacle.