Cavenaugh joins previously announced stars Faith Prince, Tom Wopat, Harvey Fierstein and Leslie Kritzer, Philip Hoffman, Katie Klaus, Heather MacRae, Lori Wilner, and Kristine Zbornik.
The musical, which has a book by Tony Award winner Harvey Fierstein and a score by John Bucchino, follows a working-class couple in the 1950s who must decide whether to spend their life savings on a family business or to launch their only daughter's marriage with a lavish wedding. The show is based on an original teleplay by Paddy Chayefsky and its film adaptation by Gore Vidal.
Cavenaugh's previous Broadway credits include Grey Gardens and Urban Cowboy. He has also appeared on the daytime dramas One Life to Live and As the World Turns.