Abdul just completed his first marathon.
He did it in a great time too, 3 hours and 38 minutes.
You might think this isn't worthy of your community's attention. It's not relevant to your community's topic and your members wont care. And if Abdul isn't in your community, you would be right.
But I bet there are dozens of members achieving great things every week in your community.
I bet members are having children, getting married, moving to new jobs, buying homes, running marathons, raising money, graduating from university. I bet there is no shortage of interesting news about your members.
This is news you should mention. It helps develop a sense of community and strong familiarity with each other. It provides a great source of easy content and encourages members to bond. It provides a support network and encourages an element of competition (the peer group factor).
Having a special congratulations post on a weekly basis will encourage members to visit more frequently. You can even let members submit their own posts for it.
It wont be relevant to your community's topic, but we know the best content for a community is content about the community.