They join the previously announced Mario Cantone and Scott Adsit.
Stage and screen stars will join the August edition of the comedy show.
The benefit for the New Jersey theater will take place on June 20.
The celebration for Tom Kitt and Brian Yorkey's new musical boasted a guest list that included Darren Criss, Michael C. Hall, and Maura Tierney.
Author Charles Messina also directs this semiautobiographical play.
The semiautobiographical comedy is hoping for a Broadway future.
Your only chance to watch Tony Award winners recite the prose of Justin Bieber.
Sondheim show veterans Ann Morrison, Joanna Gleason, Chip Zien, and Alexander Gemignani were among the stars who turned out to watch the new film.