Info from Wikipedia
Gaston Hall is an auditorium located on the third and fourth floors of the north tower of Healy Hall on Georgetown University's main campus in Washington, D.C. Named for Georgetown's first student, William Gaston, who also helped secure the university's federal charter, Gaston Hall was completed in 1901, around twenty years after the construction of the building within which it is housed.
The 740-seat hall (including orchestra and balcony) is today used for numerous occasions including convocations and honorary degree ceremonies, theatrical and musical performances, and speeches.