A company called Wired Impact has released an intriguing new plugin called Nonprofit Board Management. The plugin is a combination of a people / board member content type, event RSVP management, committee management, and document / resource management. It's a free plugin on WordPress.org, and they've also got a couple of paid extensions for more advanced event functionality.
This plugin looks like it's got some pretty nice functionality. However, it also seems extremely niche, especially when the functionality itself seems as if it could be applied much more generically if it weren't for the limited labeling that's applied. If I were them, I'd look at making this plugin a bit more flexible than for “boards” in particular.