Money McDonald’s 12 days of Christmas 2021: Get free food through Christmas Eve with Mariah Carey menu December 14, 2021December 20, 2021Kelly Tyko, USA TODAYComments Off on McDonald’s 12 days of Christmas 2021: Get free food through Christmas Eve with Mariah Carey menu McDonald's collaboration with Mariah Carey is here through Christmas Eve. Get free food with a $1 purchase and a chance to win a free beanie or shirt.