Rachel (and friends)-
Take the train (Amtrak Northeast Corridor - Acela is neat, but 4x the
cost) to DC's Union Station.
From there, take Metro (subway) to the Convention Center - here is
Metro's trip planner link -
http://www.wmata.com/rider_tools/tripplanner/tripplanner.cfm
From Union Station, take the RED LINE toward SHADY GROVE to Gallery
Place/Chinatown - The fare is $2.20.
At Gallery Place/Chinatown, change to the GREEN LINE toward GREENBELT
and exit at Mt Vernon/7th St-Convention Center.
As an alternative to Metro (subway) - you can try the DC CIRCULATOR
(Georgetown - Union Station, The Circulator stop at Union Station for
this route is located on the bus level of the parking garage,
accessible from the mezzanine level of the station.) The fare is only
$1.00, the closest stop to the Convention Center is Massachusetts Ave.
NW/7th St.
Guy VanderLek