A quick update - in the UK we have the camping and caravanning club, who provide a monthly magazine to all members as well as a website which has some questions and answers on general outdoors topics. I will see if I can add some links from there or connect with them in some way.
Just some stats from Security Stack Exchange so you can get a feel for what might be right:
At the initial private beta we actually had 5 times more questions and answers per day than we do now, but this dipped to a fifth of where we currently are by a month of coming out of beta, and we were quite worried for a short while.
What we focused on then was ensuring good quality answers, monitoring tags SE-wide to check for questions which might be appropriate to migrate and most importantly of all, spreading the word:
- twitter - especially around industry conferences - if a topic came up we'd ask a question on it, then tweet the link along with the conference hashtag
- blog - post interesting questions or answers on our personal blogs
- events - we let the SE staff know about key industry events and got sponsorship to some of them to attend, spread the word etc
- numbers - we tried to get more of the community onto chat and meta so they could come up with ideas and help out (trying to do this with a handful of individuals is hard work)
As things came back up past the key thresholds, it spiralled up and became much easier to sustain and increase growth.
Try a bit of everything, and hopefully we can make this site successful.