Hey, I live in New Orleans and have gone to WDW for the past 16 years for Mardi Gras. The crowds are not that bad at all. The only time it is bad is when it falls the same week as Presidents Week. You will notice many people from New Orleans as schools are off all week. Last year I noticed many Canadians as well. There are normally E-Ride nights, and I know they used to have a Mardi Gras parade at PI but I am not sure if they still do. I do know that Universal has some type of Mardi Gras Celebration though. Mardi Gras is the week before you are going, but if PI has something, it will probably last a few weeks.