Red Bull Theater has announced that Lesli Margherita, Simon Pearl, Michael Pilato, and Vaden Thurgood have been added to the cast of their one-night-only benefit performance of the hit 1968 rock musical "Your Own Thing" on Mon Dec 12 at 7:30 PM at the Peter Jay Sharp at Symphony Space. Previously announced cast members Eddie Cooper, Lilli Cooper , Jennifer Sánchez & Santino Fontana. The performance will also feature special appearances by Michael Cerveris , Robert Cuccioli, Tovah Feldshuh, Richard, Ken Page, Patrick Page, Estelle Parsons, Jay O Sanders, Mary Testa, John Douglas Thompson & Bruce Vilanch.  With Music & Lyrics by Hal Hester and Danny Apolinar, and book adaptation by Donald Driver, the original production opened on January 13th 1968 at the Orpheum, produced by Zev Bufman & Dorothy Love, where it ran for 933 performances. In the late 1960s, a raging storm shipwrecks a young music duo, twins Viola and Sebastian. The pair end up in the land of Illyria, which looks very much like New York City, and the rest is Shakespeare’s Twelfth Night–well, kind of. Gabriel Barre will direct, with musical direction by Greg Pliska.  This special event is made possible in part by The Marta Heflin Foundation. To purchase tickets for this one-night-only -event, visit redbulltheater.com/your-own-thing.  Press contact: David Gersten & Associates (212/575-0263)...