Around 1994 I was surprised to learn that Caelus, makers of CMS, a closed-loop, just-in-time MRP (Materials and Resources Planning) package, held international annual conferences with a user base of only 140 customers. When Wang held the last Wang conference in Boston, InterACTION 97, they had 10,000 VS systems under maintenance. ISWU, the International Society of Wang Users, had already closed its doors by that time.
Caelus proved that it doesn't take a whole lot of customers to have a viable annual conference. Today we can use Internet tools and perhaps have a user society and periodic events without even traveling at all.
I'm considering starting a non-profit corporation to be the new Wang user society.
What do you think?