But the Western calendar was handed down by the Romans, and embraced by the Roman Catholic church who propagated it globally, and Saturnalia begins December 17th ("the farmer should have finished his autumn planting") link here. Since today is December 7th here in California (as I write this), there's just 10 days left before Saturnalia begins! Hooray!
To celebrate the holiday season, we put out lights and wreaths around our very green & temperate yard. We had to adapt the Phoenix lighting scheme to our new environs, and had the addition of several sets of blue LED lights which we've found to be phenomenally bright (bought after Christmas last year, on massive mark-down). So while there are no more cacti, there are many more - and much larger - palm trees and street facing windows.
Happy Saturnalia to all! And if you celebrate Christmas, then a Merry Christmas to you as well.