The hit West End revival comes stateside via Digital Theatre, CinemaLive, and Fathom Events.
Guests included Ben Vereen, Stephen Schwartz, and Gretchen Cryer.
The film will hit movie theaters for one night only on October 23.
Sondheim show veterans Ann Morrison, Joanna Gleason, Chip Zien, and Alexander Gemignani were among the stars who turned out to watch the new film.
The new edition of Sondheim and George Furth's 1970 musical will feature the character of Bobby as a gay man.
Lewis and Jordan will join Bernadette Peters in the new Sondheim-Marsalis collaboration.
The New York cinema is now selling additional tickets to the nearly sold-out, one-night-only event.
Cyrille Aimée, Meg Gillentine, and Tyler Hanes also join the cast.