The companies of Phantom, Avenue Q, Cinderella, and Piece of My Heart were also on hand.
The Tony nominee's new play will open at the Scranton Shakespeare Festival.
The Tony-nominated Cinderella costars reunite for Transport Group Theatre Company's one-night-only event.
Drescher was joined by her costars, including Carly Rae Jepsen, to toast the occasion.
The Broadway vets take on the roles currently played by Carly Rae Jepsen and Fran Drescher.
The nanny from Flushing can now be seen in the musical through the end of June.
Carly Rae Jepsen and her prince charming, Joe Carroll, are among the performers delighted about the new performance opportunity.
The performers replaced Laura Osnes and Harriet Harris earlier this year.