Hotel
Please book through this link to get hotel block discounted rates
Flight
Dulles International Airport is the closest airport to the area (around 15 minutes away). If you're planning on visiting DC, you may also consider flying into Reagan National Airport but please note that it's an hour drive to the wedding area.
Train
If you're traveling by train, the station in DC is an hour away from the wedding area so you'll need to find transportation from there.