Flight
There are 3 major airports nearby: DCA, IAD, BWI. All about 40min~50min to the event area. From DCA you can take a train (Red line to Shady Grove, ~1hr). But you will have to travel by car from the BWI and IAD.
Hotel
There are a few hotels in this area that could be convenient for your stay. Lots of food & drink options, and a quick dry clean place too. The afterparty will be in this area. Below are links to 4 hotels: Courtyard (https://www.marriott.com/en-us/hotels/wascg-courtyard-gaithersburg-washingtonian-center/overview/) Marriott (https://www.marriott.com/en-us/hotels/waswg-gaithersburg-marriott-washingtonian-center/overview/) Residence Inn (https://www.marriott.com/en-us/hotels/waswn-residence-inn-gaithersburg-washingtonian-center/overview/) Springhill Suites (https://www.marriott.com/en-us/hotels/wasgt-springhill-suites-gaithersburg/overview/)