Posting this in preparation for actual planning. If you're flying in, Dulles International Airport is the best way to go by far. If you're riding a train, you want to aim for Union Station in DC.
Flying: Gatewalker (arrive Wednesday 9:50 pm, depart Sunday 2:50 pm)
Tonfa (Arrive Thursday 8:35 PM IAD, depart Sunday 6:15 pm)
Niu (Arrive Thursday 7:45 AM IAD, depart Sunday 9:15 AM)
Dhyer (Arrive Monday, depart Sunday 4:55 PM via DCA/Reagan International)
Tide (Arrive Thursday 4:03 pm, depart Sunday 3:20 pm)
MC (Arrive Friday 5:06 pm, depart Monday 7:50 am)
Jim & Nick (Arrive Thursday 10:30 am, depart Sunday 11:03 am)
Tal (Arrive Wednesday 9:10 pm, depart Sunday 6:15 am)
Train:
Driving: Meeple (Passengers: Elf and Ciato)
OK