try and build "the community" outside of the effort of one or a few people. This is hard. My example: we've built some quality dirt jumps for bike riders, and while there's a core group of ~10 people, you don't need all - or any - of them to come out for success. The location is the host and either a regularly scheduled or casual event keeps the community going. If people stop, the community will die and we'll move on.