Members of the public gathered at Sandringham from early on Christmas morning to greet the Royal Family as they left the service at StMaryMagdalene Church.
Other churches taking part in the project are StMary Magdalene's at Gwaenysgor, St Michaels in Caerwys, Eglwys Crist at Rhes y Cae, and St James Church in Holywell.
Prayers will be said on Sunday morning at a service dedicated to Drummer Rigby at St Peter the Apostle Roman Catholic Church, in Woolwich, as well as during a service at the town's StMaryMagdalene Parish Church.