""Blessed Advent"? Methinks we're a bit late on this one..."
Very good greeting, or you could say, "A Blessed Nativity Fast to you", but that might sound really odd to "Anglos". In any event, better late than never!
OK, maybe it's a bit early, but it's never too soon to get in the spirit of things.
And a happy, belated, St. Nicholas Day to all.