Early June?
Drive up to Reading PA for WWII Weekend, Not too far from DC. June 3/4/5.
If hanging locally go to NASM, then take the bus,(get tickets inside NASM) to Dulles, I believe they still run daily busses out there.
Nothing compares to seeing Ar234 or Fw190F8, NiK2, The list at Dulles goes on and on my friend. I spent at least 5hrs there on opening day. I you got a set date, I might be willing to drive down and visit Dulles. Probably got some new stuff down there by now.