Pretty sure that’s quite out of the question nowadays, given the current state of the world. The logistics (and liability) for putting together a giant group event is a no-go.
However, it’s not too uncommon for members to take the initiative themselves for informal get-togethers when they’re passing through an area. @flipcollar did this a while back and it was pretty great:
There was also a general “NY/NJ Meetup Thread” running for a while where a few of us locals got together a couple of times over the years to train and then grab food.
So, yeah and no, there are no plans on the horizon for an official T-vention. But if anybody wants to arrange to meet quasi-anonymous online personalities in the real world, um, I guess good luck??