(http://img.photobucket.com/albums/v705/cns/bamboozlers.png)
As it has not been announced on the Six Flags website yet, it has been confirmed on the Bambooze Roadshow website (http://party.thebamboozle.com/profile/TheBamboozleRoadshow) and Six Flags' facebook. (http://www.facebook.com/sixflagsgreatadventure) Just scroll about half way down.
Edit: The show has been confirmed for June 24th! Two stages of events all day long, tickets are $20 a person (plus park admission if you don't have a pass).
Tickets are currently only on sale for Season Passholders, and will go on sale to the general public this Friday!
More details in the comments of this post!
(http://www.sixflags.com/greatadventure/assets/images/gallery/gallery_bamboozlelist.jpg)