Readings are here.
New Advent has some interesting history and thoughts here.
Really though, today is for spending time with family and celebrating the birth of our Lord, Jesus Christ. I find it difficult to even wrap my head around the idea that the God who created the universe would so lower Himself to join us in this mortal existence, just so He could die for us a few decades later. Mind blowing, really. And something to be incredibly thankful for!
Merry Christmas readers!