Boston area: Volunteering opportunities?

Boston area: Volunteering opportunities? I've been a stutterer my entire life and am at a point in my life where I'm very happy professionally, despite my stutter. I still do stutter, but can now confidently say that I'm a *recovering* stutterer. Now, I want to spend a few hours each week helping kids/adults who are taking help from any local stuttering support groups, in whatever capacity I might be able to. So I'm looking for opportunities to volunteer near Boston. Any leads?