This year, Fat Tuesday or Mardi Gras Day falls on February 27th. It is always the day before Ash Wednesday. The first Pre-Lenten balls began in New Orleans in the 1700's. They were banned during Spanish rule, and after the Louisiana Purchase until 1823 when the celebrations were reinstated. Since the party in the French Quarter of New Orleans starts the preceeding Friday night, you're not off base in planning your party for the weekend before.
Most party stores have supplies in the traditional green, gold and purple.
Get plenty of throws, which are gifts of beads and doubloons that are thrown from the parade floats. If you're not familiar with Cajun or Zydeco music, you might try one of the Alligator Stomp compilations. You can't go wrong with any of Beausoleil's CD's either. Gradually add olive oil and then vinegar, Worcestershire sauce, celery, parsley, oregano, and Tobasco. Top with Turkey and cheese slices and remaining bread half.