Fans dressed as characters from the film gathered at The Grove to perform parts of "Jolly Holiday" and "Step in Time," and then gathered around Van Dyke, who played chimney sweep Bert in the film, to sing along on "Let's Go Fly a Kite."
"I am very grateful that at 90 years old, I can still go out and play," Van Dyke wrote on Twitter. His actual birthday is Dec. 13. The Disney Examiner posted the following clip of the event:
Before he began his film career, Van Dyke performed on Broadway and television.
Van Dyke made his Broadway debut as a featured player in the short-lived musical revue The Girls Against the Boys. With music by Richard Lewine and Albert Hague and sketches and lyrics by Arnold B. Horwitt, the show premiered Nov. 2, 1959, at the Alvin Theatre. Nancy Walker and Bert Lahr headed a cast that included Annie lyricist Martin Charnin.
Critics appreciated the talented array of performers but felt the show itself was unremarkable. The New York Times' Lewis Funke, who called Van Dyke an "amiable performer," claimed that without Walker and Lahr the "entertainment at the Alvin would be somewhat tedious going, indeed." The production closed after 16 performances.
The following year, Van Dyke starred opposite Chita Rivera in the Charles Strouse-Lee Adams-Michael Stewart musical Bye Bye Birdie. The Tony-winning production opened at the Martin Beck Theatre April 14, 1960.
For his breakout performance as Albert Peterson, Van Dyke received the 1961 Tony Award for Best Featured Actor in a Musical. He would later reprise his Broadway role in the 1963 film adaptation starring Maureen Stapleton and Janet Leigh.
Here is a clip from the film (below), in which Van Dyke sings the show's breakout hit, "Put on a Happy Face," with Leigh...and some camera magic.
In 1980 Van Dyke returned to Broadway in a revival of Meredith Willson's popular musical The Music Man. He played con man Harold Hill in a cast that included Meg Bussert as librarian Marian Paroo and Christian Slater as Winthrop.
Directed and choreographed by Michael Kidd, the production opened June 5, 1980. The critical response was that Van Dyke was good — too good, in fact, to play a crook like Harold Hill.
"He's a nimble performer," wrote Walter Kerr in his New York Times review, "but he's a straight shooter, honest from the word go, virtue spilling out of every pocket, innocence written all over him where sly graffiti should be. He's simply — and only — nice." The revival closed after 21 performances at City Center.
In 2006 Van Dyke made his final (so far) Broadway appearance as a special guest star in the stage autobiography Chita Rivera: The Dancer's Life. He joined his former Bye Bye Birdie co-star Chita Rivera for four performances at the Gerald Schoenfeld Theatre.
Van Dyke originated the role of Caractacus Potts in the movie "Chitty Chitty Bang Bang." He recreated the movie's title tune at the D23 Expo Aug. 16, 2013. Van Dyke was joined by The Vantastix, an a cappella group started by Van Dyke and Mike Mendyke.