Universal Studios is now celebrating Mardi Gras on Saturdays and select nights from February 9th through April 20th. It's one long street party with food, music, dancing, and live entertainment. There will be about 14 big shows featuring acts like Steve Miller Band, Montgomery Gentry, Phillip Phillips, and Pitbull.
There will be plenty of French Quarter street music. While you're there check out the City Walk Clubs such as Pat O'Brien's Pub and Bob Marley's (my favorite).
Florida residents are eligible for a $25.00 discount. Mardi Gras is included in your Premium Annual Pass. There are also package deals for residents such as $115.00/night per person/per night at one of the Universal resorts. Go to Universal Studios web site or visit some of the other sites such as Kayak and Orbitz. They are also good for package deals.