Alex, I've been involved with ARMA that Jenn mentioned above. Are you sure you're not confusing them with other groups in your area? I'm pretty sure there are Bay Area groups that have a similar focus, teacher/student (rank) hierarchy, charge for lessons, and may even have similar acronyms for the organizations.
The group I was involved in was a "study group", no money involved. Just a gathering to share info and practice, and most all prompts and direction came from the historical research and practice recommendations from ARMA.
That being said, I do contribute annually to the ARMA cause, and you can get some recognition, at selected events, if you want, but is is far from necessary and inconsequential to learning and practice (and I believe that is the orgs stance on the subject). But I can see how they could give the wrong impression from the web site--give them another shot, and I think it may help you find what you are looking for.
Jenn, coincidentally, on the ARMA forum someone asked about shoes. I replied, in part, I sometimes use turnshoes from Historic Enterprises (I'm not a reinactor, more of a collector, but I originally purchased them specifically for practice/experience).
Armor--some do, check the open video area. But the cost of the accurate stuff is prohibitive to most. web page