This is the week.
http://www.usasciencefestival.org/2010festival/expo
FIRST can be found at NM-3 Booths 341-357 (numbering makes me smile...) I have no details to give, but know teams have been invited.
Lots of Robotics Education and Competition Foundation representation in the Lockheed Martin Tent #3. (located NM-4, across from Air and Space Museum). There will be numerous playing fields with a specially designed game using VEX robots, cycling students/guests through hands-on driving.
Come by and say hello!