Ellington Track and Field is the new location for 2019's Hit the Bricks: DC. It is located in Georgetown on 38th St, NW, off Reservoir Road and across the street from the entrance to Georgetown University Hospital. If driving, use the address 1600 38th St NW, Washington, DC 20007 to navigate to the track's entrance.
Good news! The track's surrounding streets will have plenty of street parking on this Spring Saturday, mostly for free or metered 2-hour parking.
Driving, Ubering or busing to this year's HTB is your best bet. Georgetown is known for many things, but Metro isn't one of them. The closest metro stations would be Foggy Bottom or Rossyln, from which you could Uber or bus to the location.