We are at sixes and sevens this year, because the feast of the Annunciation was trumped by Good Friday. When that happens, by Holy Week or the Easter Octave, the Annunciation is transferred to the first available day after the Easter Octave.
In the Roman rite and our ACC calendar, it was two days ago, Tuesday 5th April. In the Use of Sarum, we had St Richard, Bishop and Confessor on Sunday 3rd, but who was trumped by the first Sunday after Easter. His first available day was Tuesday 5th April. My Sarum Kalendar 2016, compiled by Dr William Renwick, gives today as the day for the Annunciation.
Everything comes to he who waits…. Be it done to me according to thy Word.