Michael Schoch, Answers questions on Noodle
That's an awesome idea. Kudos to you for taking research to the next step!
Marin Montessori School has a parent's association that puts on fundraisers and groups activities. You can view the activity schedule on the school's homepage and you can read about the association on a separate page.
However, to get in touch with the parent association you will first have to call the school at 415-924-5388 or email it at email@example.com.
Good luck getting involved!