"Astronomy Cast and the Bad Astronomer his bad self are planning to have meetup for all you wonderful fans and friends out there who will be at the AAS meeting or who feel like driving to Austin."

Is the AAS meeting open to anyone, or is it restricted to professional astronomers or AAS members? Austin is too far for me, and I have other commitments, but I am curious about the general policy for interested people who may want to attend the meeting.