If you're looking to celebrate Mardis Gras in Orlando, Universal Studios is the place to head, where it's Carnivale from February 9th through April 20th. Even Disney's very own Demi Lavato (she may be off Disney Channel but she's still with Disney's Hollywood Records) will be joining in the celebration!
I must admit, if there;s one way to lure me off Disney property, it would be to tempt me with a New Orleans like party. Have you ever done this event? Do you think it sounds like fun?
http://www.universalorlando.com/Events/Mardi-Gras/Concerts.aspx