My dream for an event like this:
Friday afternoon, Smithsonian in downtown DC. Initial gathering, plenty of time to view things.
Friday night, dinner at local pub
Saturday late morning, go to Dulles for XYZ tour (too many of you are pilots and have to make this happen)
Saturday late afternoon, go to the Smithsonian hangar at Dulles. Get a private tour if possible?
Saturday night, on your own time.
Sunday morning, farewell breakfast.
Of course this needs a good 20 people minimum to make it work. I'd help put it together if we found interest