I've had this particular calendar since 1973:

I don't quite understand it, to be honest. Is that the three kings hanging out with the baby Jesus who's dressed as Santa?

As a rule, we keep our Santa stories and Jesus stories separate. It reminds me of a friend of a friend who swears that while traveling in Asia many years ago, he saw Santas on crucifixes being sold as Christmas ornaments.

(This good case in point can be found
from Jesus of the Week)