It's been a while since the Washington group has had a meeting, so I'm pleased to see this VoCamp coming up. Unfortunately, given that it's on weekdays and I've already scheduled my vacation for the year, I'll be missing out again.
Is there any interest in having a VoCamp on a weekend some time? It could be focused on similar vocabularies, like geolocation, or even something something more "fun", such as movie collections. The latter may make the session more accessible to people who don't have a professional need for geolocation, but still provides the practice and cross-pollination of ideas that a VoCamp typically enables.