In addition to Diaz and Boone (Seven Brides For Seven Brothers, The Sound of Music), also added are Daniel Goldstein (Godspell), Jonathan Marc Sherman (Knickerbocker, Things We Want), Julian Fleisher (Coraline) and Kait Kerrigan and Brian Lowdermilk (Henry and Mudge, Samantha Brown).

They join the previously announced Mandy Gonzalez, America Ferrera, Julian Fleisher, Richard Kind, Marc Kudisch, Nellie McKay, Anthony Rapp and Nat Wolff.

Presented by The 24 Hour Company and the Exchange, the annual event will be held at The Gramercy Theatre (127 East 23rd Street). Tony winner Ted Sperling is the creative director for The 24 Hour Musicals.

The creative process, according to presenters, "begins Sunday, March 6 at 9 PM when all participating artists will convene at the National Arts Club on Gramercy Park with a prop or costume piece to inspire the writers. After the company is briefed, the actors and directors will leave the writers to create the book, music and lyrics for their 15-minute musicals …in just eight hours. At  7 AM Monday morning, the directors will return to read the completed musicals and finalize casting. An hour, the actors will return to begin a twelve-hour rehearsal process. At 8 PM, ink barely dry, the four new musicals will be performed for a live audience. Although the actors only have one day to memorize lines, lyrics and music, create characters and learn blocking, the musicals are performed without scripts in hand."

Following the performance, a VIP reception will take place at The National Arts Club. Proceeds from The 24 Hour Musicals benefit the Exchange, a NYC not-for-profit that develops new theatre work through productions and its development center for innovative theatre companies and artists in the Catskills, the Orchard Project.

Tickets for the event are $100 - $450. Tickets are available by visiting 24HourPlays.com or by phoning (646) 224-5977.