Establishing and building a community around a common interest is hard.

After exhausting your network of friends, coworkers, neighbors, etc – the only way of getting new folks into the community is to aggressively campaign and advertise to them.

Let’s say you’re a technical user group (like a couple of the ones I’m a part of). And every month you have about 5-7 folks who show up on the Appointed Day™ for the regular meetup. You can either be satisfied on the size of the group, or you can try to grow it.

Growing it, however, is never easy: there are scheduling conflicts, personality clashes, lack of contacts, etc.

What are the best ways – or even just “ways”, ditch the “best” – of growing a community after you have gone through everyone you know?