I go to the Portland NSA and our attendance can fluctuate anywhere from 10-18 people. However, that also includes some local SLPs and SLP grad students. We usually have a group facilitator that may have some questions to ask at the beginning of the meeting and conversation really flows from there. It's pretty relaxed and at this point it's a lot like a bunch of friends hanging out and chatting. I think the biggest thing that helped me was the sense of community and just talking with people that experience life the way that I do.