Watch live Tuesday: New Orleans celebrates Mardi Gras

In the United States, Mardi Gras is an event that is very much celebrated in some southern cities. French for Fat Tuesday, Mardi Gras is always on the Tuesday before Ash Wednesday. This year it will be held on Tuesday Feb. 13. Mardi Gras is only one day but the Mardi Gras season, also known as the carnival season, can last for weeks culminating on Fat Tuesd