Cirque du Soleil is offering attendees of NCDM discounted tickets to select performances in December 2011, with 35% off Mystère, Zumanity, KÀ, and Viva ELVIS, and 20% off Michael Jackson THE IMMORTAL World Tour. Attendees can call an 800 number and mention a delegate offer to purchase tickets by December 14th for shows completing their Las Vegas trip.