The event — which will include an intimate dinner and entertainment — will take place at Pier Sixty at Chelsea Piers in New York City. Scott Ellis (Twelve Angry Men) will direct the evening's highlight of an "original, all-star musical tribute," according to an announcement.

The lineup of stars set to perform include Christine Baranski, Polly Bergen, Harolyn Blackwell, Barbara Cook, Veanne Cox, Alan Cumming, Boyd Gaines, Victor Garber, Judith Ivey, Judy Kuhn, Marin Mazzie, Debra Monk, Donna Murphy and Bernadette Peters.

The Roundabout presented Sondheim and John Weidman's Assassins last season, garnering the most Tony Awards and the duo's Pacific Overtures this season. A transfer of a London staging of Sweeney Todd is also a possibility for the coming season.

Sondheim will be presented with The Jason Robards Award for Excellence in Theatre — named for the stage and screen actor who served on Roundabout's Board of Directors. The award was introduced in his memory and in honor of his unique contributions to the American theatre. It was first presented to actor Christopher Plummer in 2002 and has since been bestowed upon John Kander and Fred Ebb in 2004.

Previous galas have included a tribute to John Kander and Fred Ebb featuring Richard Gere, Liza Minnelli and Chita Rivera (2004), the Celebration of Roundabout's Great American Musical Series (2003) featuring the Tony-winning revival of Nine, the Inaugural Celebration of Roundabout’s Jason Robards Award for Excellence (2002) honoring Christopher Plummer, the Celebration to Honor Stephen Sondheim (2001) featuring Roundabout's revival of Follies, the Inaugural Celebration of Roundabout's new American Airlines Theatre (2000) featuring Uncle Vanya and the Celebration of Roundabout's Great American Musical Series (1998) with the revival of Little Me. For more information, contact Steve Schaeffer at (212) 719-9393 or visit www.roundabouttheatre.org.