The Hilton Garden Inn in Falls Church has reserved a block of rooms for reunion guests at a discounted rate of $115/night. They anticipate that their regular rate for October will be $143/night. You can make your reservation by calling the hotel directly or use their personalized web site.
Contact information for the hotel is
Hilton Garden Inn, Falls Church
706 W Broad St
Falls Church, VA 22046
or their YHS71 Reunion web site