Just read this thread and I had an idea:
start for christmas lights will be through Advent (from the week before 1st Advent) to end of Christmas, which is “Mariä Lichtmess” (2nd February) in former times.
Maybe it will be a variant to calculate 1st Advent by rule:
and set an item on Monday before 1st Advent.
Within the Christmas Lights rule you query if today is between the start date (Monday before 1st Advent) and the end date (2nd February or 6th January) and then you turn on the Christmas lights.
For this you should Trigger the rule from November to February (or January) every evening…
So you will never miss the beginning and the end of the season…
Andreas