I lived in Lousisiana for two years in Grad school. Best thing about living in Louisiana is the food AND the fact we get a week off in February to celebrate Mardi Gras. Mardi Gras or Fat Tuesday is a holiday that is derived from the French Carnivale. It happens on the eve before Ash Wednesday which is the beginning of Lent for all Catholics. Because Catholics must abstain from pleasures during Lent, Mardi Gras is an evening where one is supposed to revel in pleasure (because you're about to give something up.) A lot of people forget that Mardi Gras is a religous based holiday and it only has such as large base in New Orleans due to the fact that a large population of New Orleans is still Catholic.
Mardi Gras is some form or another is also celebrated in Belgium, Amsterdam and Italy with their traditional Carnivales which happen at a similar time. There is also gay Mardi Gras in Sydney, Australia where they take the day of Mardi Gras and use it as a venue for their yearly Gay Pride festival.
TRADITIONS- AND WHAT THEY MEAN