Hotel
This is the hotel the reception will be held at. The cocktail hour/reception will be held downstairs if you come through the main entrance, or if you drive around back, you can park right by the back patio and walk right in to the event area.
Travel Note
The two closest airports are DCA (Regan National Airport) and IAD (Dulles International Airport). The wedding ceremony is closer to DCA but the reception is closer to Dulles, so really either one is fine :)
Travel Note
If you're planning on taking a trip into DC the metro works well and is a way to avoid hunting for parking on a weekend.