By Plane. Attendees are encouraged to use Washington Dulles or National Airports. Baltimore's BWI is also an option.
Uber/Lyft. Ride sharing services are the most economical car-based option from the regional airports.
Washington Metro from Washington National Airport (train). Take the Metro's yellow or blue lines from Nation Airport. You will change to the red line and exit at Twinbrook Station. Cost is $3.85. Time is approx 1 hour (includes changing lines). The Metro system offers a convenient online trip planner. Simply plug in Washington National Airport as your starting point and the Hilton's address as your destination (1750 Rockville Pike, Rockville, MD 20852): https://www.wmata.com/schedules/trip-planner/