Tuesday 1 November is the Solemnity of All Saints and is a Holyday of Obligation. Mass will be celebrated in the Abbey Church at 8.45 a.m.
In the early 7th century, after successive waves of invaders had plundered the catacombs, Pope Boniface IV gathered up some 28 wagonloads of bones and reinterred them beneath the Pantheon, a Roman temple dedicated to all the gods. He then re-dedicated the shrine as a Christian church to Sancta Maria ad martyres. The date was 13 May 610 and the feast became known as Sunday of all Martyrs, later of All Saints. This feast of All Saints was eventually transferred to 1 November.
Wednesday 2 November is All Souls' Day, and Mass will be celebrated in the Abbey Church at 8.45 a.m.
From the early ninth century onwards, monasteries began to commemorate their dead as well as the souls of their benefactors. This was formalised by Odilo of Cluny in 998 as a day of psalm-singing and almsgiving, but above all the celebration of masses in memory of all those who rest in Christ, to be observed on the day following All Saints.