park hours are always a good measure of expected crowds. The 11th and 12th are looking to have pretty average off season crowds (perhaps a little higher due to the 50th) as evidenced by DL's normal off season hours of 10 am to 9 pm (pushed back an hour from the usual 9a-8p hours due to Remember) and DCA open 10-6p. Friday and Saturday, the 13th and 14th, however, will be packed (as all weekends are).
-Kyle, Member of the DCA Lovers Alliance
I'M GOING TO YALE!!!!!!!