Flight
Dulles is the closest airport to the venue (15-30 min). It is a hub for United Airlines. Baltimore/Washington Airport (BWI, 1-1.5 hours) and Washington National Airport (DCA, 30 - 50 min) are also good options.
Hotel
There are lots of hotels near the venue. This one is about a 10 minute walk (0.3 miles) from the silver line Spring Hill Metro stop.
Travel Note
DC Metro is a very safe and useful way to travel in the DC area. You can pay for rides by tapping your credit card. You will need to tap on the way in and the way out. Many of the trains travel underground and it can be a bit disorienting when you reach street level. Google maps will usually tell you what signs to look for to exit the station at the best point.