Because the Annunciation of the Lord (March 25) and the Anniversary of the Dedication of the Abbey Basilica (March 28) fell during Holy Week this year, they were transferred to Monday and Tuesday respectively of the second week of Easter.
On Monday, 4/8, Mass and Office of the Annunciation will be celebrated. On Tuesday, 4/9, Mass and Office will be the commemoration of the Basilica’s dedication. Tuesday will have Solemn Vespers.