Mardi Gras 2012, PHOTOS: Mardi Gras 2012, The 2012 New Orleans Mardi Gras Parade Schedule. A list of dates, times and routes for the 2012 Mardi Gras Parades in New Orleans.By dawn on Wednesday, Mardi Gras was just a memory in New Orleans.Stately St. Charles Avenue was cleared of mountains of trash left behind by thousands who had feasted, drunk and scrambled for beads hours earlier.