Rationality Dojo Examples?

Early on in my exposure to Less Wrong I encountered the metaphor of Rationality as Martial Art. I assumed at some point I would be a member of an active Rationality Dojo, regularly training and becoming progressively more formidable as I learned the Art.

Several years later, though I meet regularly with an awesome local group whose company I greatly enjoy, I still feel as though my training has not yet begun.

Can anyone point to an example of an active Rationality Dojo? What do you do there (Games? Exercises? Kata?)? Who are the instructors? The closest examples that I’ve seen are the Mega- and Mini-camps; can anyone shed some additional light on what went on there?