To be honest, I think that having only the 3DS version might make things easier. I mean, with the Wii U version, you'd only be able to have up to 4 people playing per console, and that's assuming we'd have more than one available. With the 3DS version, you could easily have a bunch of matches going on all at once, and they don't even need to be in the same area to do it (as they would with the Wii U being plugged into a TV/projector).
If you think that there should be an event, I'm sure the staff would be open to the idea of it. You'd have to make sure you had someone to run the event, though (assuming you don't want to yourself).