Comment: Several advocacy groups (Score 1) 327
- http://www.planetary.org/home/ The Planetary Society
- http://www.marssociety.org/ The Mars Society
- http://www.nss.org/ The National Space Society
- http://www.seds.org/ Students for the Exploration and Development of Space
- http://www.space-frontier.org/ Space Frontier Foundation
Coming up is a conference where many of the space advocates will convene - so to answer the question directly, they will be in Washington, D.C. the end of this month: http://www.isdc2008.org/
There are several commercial interests, including the Artemis Society, http://www.asi.org/ and http://www.virgingalactic.com/