Even though the apparition was on December 9, 1531, the feast is today! You can wander over to YouTube and find lots of mananitas – some beautiful, some more enthusiastic than anything else. The Internet can take you right to the Basilica in Mexico City, if you want. This is my favorite.
Or you can just enjoy the story of the apparition. An Indian neophyte, the mysterious sound of birds singing, the beautiful woman, roses in winter and an astonished bishop.