On Oct. 29 from 8 p.m. to 10 p.m., the Argento Chamber Ensemble will be holding their Founder’s Day concert at Coolidge Auditorium, located in the Thomas Jefferson Building at 10 First Street, SE. The concert is free to the public. For more information about this event and its pre-conversation with the artists, and information about reserving free tickets, visit loc.gov/concerts/tickets.html.