Mardi Gras is a day of celebration and partying before the rigors of Lent’s forty days of fasting and sacrifice begins. It occurs on the Tuesday before Ash Wednesday. Mardi Gras is celebrated in many countries around the world. Mardi Gras is French for ‘Fat Tuesday’. So I guess the whole purpose it to live large on Tuesday before you make your sacrifices on Ash Wednesday for an entire forty days!