Since forming, we have started a OneList discussion group, where all members receive all emails addressed to the Forum. The meetings started out formal, but the organization started to grow too big and getting speakers was too difficult given the return. So now we only occasionally have industry "big wigs", and then we don't advertise.
Our philosophy is, if you feel the sharing is valuable, you'll come even if it's only "us" that will be there. We have a core group of 8 or 9, and the discussions are fantastic. Lately focus has been on web page design and internet marketing.