There are all sorts of reasons why we choose the Mass we usually go to: maybe it’s the music, or the lack of it, or the bells and smells, or the lack of them… On a normal Sunday, whatever Mass we choose and for whatever reasons, we will at least hear the same readings. It is not so, however, when we choose our Christmas Mass. I am quite sure no one decides which Christmas Mass to attend on the basis of what the readings are going to be, but nevertheless our choice makes a difference. There are actually four Masses of Christmas, with different prayers as well as different readings, and each of them will fulfil your obligation: the first is the Vigil Mass, for the evening before; the second is the Midnight Mass, the third the Dawn Mass and the fourth the Daytime Mass, which might be used several times if your church has lots of Masses on a Sunday.