Mardi Gras is costume time, so for all you New Yorkers: Don't think you can get away with leaving the house in all black. Plan on working the official colors of purple, green, and gold into every outfit leading up to Fat Tuesday, because then it's time to pull out all the stops. People will spend weeks working on a costume for the biggest day of the year, whether it's an actual person, character, or just a glittery hodgepodge of wigs, wings, masks and latex. Some parades have themes that change year to year, so if you're planning to center your day on a specific event, do some research.