Hello and welcome! One of our facilitators, James, is from Canada, so hopefully, he will chime in.
I'm not aware of an organization specific to Graves', but there is a Thyroid Foundation of Canada:(Note on links: if you click directly on the following link, you will need to use your browser's “back” button to return to the boards after viewing, or you will have to log back in to the forum. As an alternative, you can right-click the link and open it in a new tab or new window).http://www.thyroid.ca/
Also, one of the attendees at last year's GDATF conference in Boston blogs about her personal experiences, and she might have some additional suggestions:http://www.rayannesthoughts.blogspot.com/
Hope this helps!