The Northern Virginia Astronomy Club is hosting a public stargazing party at C.M. Crockett Park this Saturday. Planetologist Dr. Tom Jones will be speaking at 6:00 p.m. He co-authored a book on the formation of the solar system with a planetary geologist.
Added bonus: visitors can stick around and observe some of the wonders of the universe through a variety of telescopes operated by very nice, knowledgeable people.
NOVAC website with Stargaze information: http://novac.com/
PDF with more detailed information: http://www.novac.com/gaze/StarGaze2011.pdf
A little bit of information on Tom Jones (website straight out of 1998): http://home.comcast.net/~skywalking/