The June 13 performance, part of the "Broadway Spotlight Series," is billed as an evening of humor and will feature the comedy of Nichols and May, "Mr. Show" with Bob and David, Mitch and Mickey, Monty Python, Peter Cetera, David Rossmer and Dan Lipton and Idle and DuPrez. Evan Cabnet directs with musical direction by Dan Lipton. Show time is 8 PM.

Rosen, who plays Dennis' Mother, Sir Bedevere and Concorde in Spamalot, will be joined by a few special guests during his Ars Nova debut. Those scheduled to take part in the evening include Spamalot's Christian Borle, Mamma Mia!'s Rebecca Kasper, Spelling Bee's Sarah Saltzberg, Fiddler on the Roof's David Rossmer and Nina Czitrom.

Steve Rosen is currently making his Broadway debut in Spamalot. His Off-Broadway credits include The Golem, The Castle, The Parrot, Abie's Island Rose and The A**Hole Monologues, while his regional credits include Enter Laughing, The Foreigner, Complete Wks of Shspr and Little Shop of Horrors. On screen Rosen has been seen in "Storytelling" and "Ed."

Previous "Broadway Spotlight" concerts have spotlighted the talents of Avenue Q's Ann Harada and John Tartaglia, Dance of the Vampires' Max von Essen, Les Miz’s Lauren Kennedy, Hairspray's Shoshana Bean, Into the Woods' Chad Kimball, Aida's Felicia Finley, Rent's Anthony Rapp, Wicked's Idina Menzel and Funny Girl’s Leslie Kritzer.

The Ars Nova Theater is located in Manhattan at 511 West 54th Street. Call (212) 868-4444 for $15 tickets or go to www.SmartTix.com. Proceeds from Rosen's concert will be donated to the Dystonia Medical Research Foundation.