Since most of my Christmases (but not this one, due to extenuating circumstances) have been regular family Christmas get-togethers, there hasn't been much room for me to ever have a Christmas miracle, even in the sense of getting amazingly lucky or achieving something really impressive in a video game. I had a good RA this morning (which I haven't submitted yet), but despite being perhaps my hardest RA yet, it's not even close to miracle status by any definition.
But answering this question is really about drawing on my memory of my past experiences. And I rarely ever try to pre-classify my experiences so I can answer the question, "When was a time you _____________?" (worked effectively in a group, pushed yourself to the limit, stood up to someone, etc.). I probably have a fairly decent memory of my experiences -- it's just not organized in that way at all. I think real miracles would stand out though. I have experienced a handful of those, but don't think any happened on Christmas.
So, sorry that I couldn't provide an affirmative answer. Maybe someone else?