DAR National Headquarters location:
1776 D St NW
Washington, DC 20006
Could be referring to DAR as a location for an event where an individual is expected to attend?
The DAR HQ is a city-block-long complex with a museum, library, manuscript room & auditorium, open to the public. Groups frequently rent one or more of 9 (10, counting Constitution Hall itself) spaces for parties, weddings, concerts, etc.
Spaces available for rent: https://www.dar.org/national-society/event-spaces
Map of surrounding neighborhood: https://www.dar.org/sites/default/files/members/darnet/forms/EVE-5000.pdf
Can't find a calendar of private parties scheduled for there, can any anon help?