While they are fairly rare, I'm lucky that I can count on the Ontario Team Championship to bring all the joys of a nice big team tournament fairly close to home (6 hours drive).
This year, the event filled up before 'non-sponsored, non-premium' registrations even went live, to the point there were extra spots and an additional room rented for a whooping 38 teams. That's 190 warmachine players for you!
Major thing that affected the event: Circle and Skorne both got CIDs (updates to some of their models) and as a result were more popular, thus warping the meta and changing list building.