Schedule of events:
Saturday, March 20
Noon: Backstage tour of the "Sweeney Todd" set by Production Stage Manager Kerry Epstein.
12:30 p.m.: A short film on Sondheim followed by a discussion with Washington Post critic Peter Marks and NPR's Bob Mondello, moderated by Artistic Director Eric Schaeffer.
1 p.m. and 7 p.m.: A live performance of Sondheim's music in the Mead Lobby.
Noon and 2 p.m.: "A Funny Thing Happened on the Way to the Forum" and "Gypsy" screenings at the Shirlington Library.
5 p.m.: A post-show discussion with the cast of "Sweeney Todd."
Sunday, March 21
12:45 p.m.: Signature actors discuss why they love to perform Sondheim's productions.
1 p.m. and 6 p.m.: A live performance of Sondheim's music in the Mead Lobby.
2 p.m.: Screening of "West Side Story" at the Shirlington Library.
5 p.m.: Mark Horowitz, Music Specialist from the Library of Congress, discusses the Sondheim collection and its surprises.
10 p.m.: Join in the birthday celebration with cake and a Sondheim sing-along. There will be a cash bar.