What if you could persuade a VIP to participate in your community for a day?
They might write a quick blog post, post and respond to comments on the forums, answer some questions in the shoutbox and take on a live-chat.
It’s only a day. In niches with ‘micro-celebs’, it might not be as hard to arrange as you think. Perhaps a local activist? A local journalist? Or even an old community member that’s gone on to bigger things.