Was one of the people you met with Mark Eden Horowitz?
No, probably no one you'd know. The LoC archivist is a research partner of a University of Maryland faculty member who's also the wife of Cabrillo Festival's principal bassoon. At the "Meet the Composers" event she asked a question which I knew had to be from a musicologist. So we met after the panel and I let her know I'd be in DC the following month.