Mujitsu and Tairaku's Shakuhachi BBQ

HI everyone,

I am searching for information about the activities of some shakuhachi study groups that I've heard recently, like:

- Honkyoku study group
- Komuso study group
- Ishikawa's Ishi no Kai


I also know that Takahashi Tokuyama is the head of of the shakuhachi or honkyoku study group is this right?

Who could tell me more about these groups what are their goals/purpose, etc?

Thanks.