Christmas Day:

A modern setting of the traditional English carol, The Holly & the Ivy, by Matthew Owens: sung by the Choir of Gonville & Caius College, Cambridge: [Or is it? See comment]

'Our Saviour, dearly-beloved, was born today: let us be glad. For there is no proper place for sadness, when we keep the birthday of the Life, which destroys the fear of mortality and brings to us the joy of promised eternity. No one is kept from sharing in this happiness. There is for all one common measure of joy, because as our Lord the destroyer of sin and death finds none free from charge, so is He come to free us all. Let the saint exult in that he draws near to victory. Let the sinner be glad in that he is invited to pardon. Let the gentile take courage in that he is called to life.'
Pope St Leo the Great

In contrast to all the strange and ill-thought-through theories of pagan influence on the early Church's celebrations, there's a good article here on the origins and date of Christmas - from Standing on My Head