Nine months back from Sukkot is Chanukah where My research has shown the error crept in There was an effort to disassociate from anything The Annunciation would have occurred at Chanukah.
shalom b'shem Yah'shua
the "light of the world" entered the temple.
during the fourth century under Constantine and
during the council of Nicea.
Jewish and introduce substitutes from paganism:
Ishtar and Sol Invictus .
More like replacements for pagan feasts. Devotion to Mary, if you sre implying this, goes back into the second century, because it relates closely to the doctrine of the incarnation. No festival dats for the Nativity was universdally celebrated. Some belived that Jesus died on the anniversary of his birth. The real date controversy was over when to celebrate Easter, since this is the principal Christian feast.