"Who should attend? Participation is open to all scientists/engineers involved in Mars exploration, including international colleagues. Since this is a 'working' meeting, it is not open to members of the press, however, if there is interest we can make people available for interviews afterwards."
Editor's note: Curiously, they have a presentation on the agenda titled "Mars Outreach" yet they don't want the media there. I guess taxpayers aren't welcome either.
"According to our attendance records, 166 people attended the meeting, including scientists and representatives from many of NASA's field centers, from NASA HQ, from major research universities, from the aerospace industry, and from private research organizations around the country."
Editor's note: Everyone was indeed welcome - except the media and the general public.