There's lots more on this site, including a library of outreach activities and resources used by people in the department! You just need to register for an account (or log in) in order to see it.
Dong Lai and I are organizing at least one table for the Boynton Math Day. We would welcome volunteers and/or ideas for activities that relate math to astronomy. Check out the space math website: http://image.gsfc.nasa.gov/poetry/weekly/weekly.html