That was quite a foofaraw. Christmas on a Monday! Mass on Sunday (or Saturday) for the Fourth Sunday of Advent and then Mass again(!), on Sunday (or Monday) for Christmas. It seemed to create a lot of bother. And it will happen again for the octave of Christmas, Jan. 1, 2024, the solemn feast of Mary, Mother of God. That too, like Christmas, is a holy day of obligation and it is a Monday, so all of the same considerations apply. Or not.