The Proclamation of Christmas is the martyrology for December 25th. It may be used at First Vespers/Evensong before the opening verses; during a Vigil or carols before the Midnight Mass (it works well before the Te Deum at the end) or after the Penitential Rite of the Midnight Mass (immediately preceding the Gloria).
Here is a slightly alternative version by the late Brother Aelred Seton Shanley OblOSB Cam, which includes mention the Buddha and Socrates. These liturgical moments are good ones for remembering that we live in a must-faith world without being syncretic in our worship. The Monastic Community at Bose remember all the main feasts of the major religions in their martyrology as they occur.
The Martyrology is the book of the saints, the ‘martyrs’ of the church, arranged in calendar order on the day they died (their ‘birthday into heaven’) and/or the day they are remembered liturgically. In monastic communities the martyrology of the following day was traditionally read at Prime, the Little Hour at the start of the working day. The monastery of Christ in the Desert provide their martyrology here. The Bose martyrology is here. I have produced an Anglican Martyrology for the British Isles which is very much a work in progress and is available here. It works well read just before Compline or at the end of Evensong.
The alternative Proclamation of Christmas provided here comes from the Hermitage of the Dayspring where Br Aelred Seton Shanley lived for many years. He died in the mid 1990s. He had tried his monastic vocation in a number of communities before settling to the hermit life as an Oblate of the Benedictine Camaldolese Community at Big Sur. He wrote a whole sung Office which I have used to provide some of the hymns for the Office in my musical setting.
Page 1 of the alternative Proclamation
Page 2 of the alternative Proclamation
For the traditional version, with rubrics, go here.
More here, including a video of the chanted version. Chant score here.