Mardi Gras Night, also known as Christmas, is celebrated on December 25 every year. Christmas was originally a Christian festival to commemorate the birth of Jesus, but later it became a national festival and a grand festival of the year in western countries.
Many families decorate their homes with red, green and white colors during the holiday season, and small children put a stocking in front of the fireplace or next to their pillows in anticipation of Santa Claus placing gifts in the house while they sleep, with many different customs around the world.
The origin of Carnival Night is introduced here, I hope it will help you.