The careful use of the ranking of Feasts can alleviate much confusion. When Sundays and Feast Days are listed by rank, then rules of precedence can always determine what is to occur when they coincide. The first comment at this post lists the ranking of feasts as compiled by Fr. John Fenton, according to the Tridentine(Western) Rite with a few Lutheran modifications. The second comment contains the rules of precedence. Further comments are invited.