I have only just been asking myself the question about the entry of the Annunciation in Dr William Renwick’s Sarum calendar for 2018. The Annunciation (March 25th) clashes with Palm Sunday and is scheduled to be displaced to Monday of Holy Week. The Warren translation of the Sarum missal indicates:
If this feast shall occur on any Sunday in Lent it shall always be transferred to the next day ; if it shall fall on any other day than a Sunday in Passion-tide, it shall be solemnly celebrated on that day. But if it occur on Maundy Thursday, or on either of the two days following, or in Easter week, it shall be transferred to the first vacant weekday after the octave of Easter on which it can be conveniently celebrated.
The Roman rite does not allow the Annunciation to be celebrated during Holy Week (a part of Passiontide), so it is displaced to after the Easter Octave. Sarum allows the Annunciation on Monday, Tuesday or Spy Wednesday of Holy Week but not during the Triduum. So, Dr Renwick has not made a mistake as I had suspected. Otherwise I would have had to take up the matter with him by private e-mail. None of us is infallible! But, he is not wrong.
Tuesday and Wednesday of Holy Week (after Palm Sunday) give us the Passions from the Synoptic Gospels. The Passion is not read on Holy Monday, but we are all the same brought into the intensity of human wickedness and the suffering of Christ. A feast, even of Our Lady, seems displaced. I am inclined to take the liberty of transferring the Annunciation to April 9th, which is the Monday following Low Sunday.