As far as it is commonly understood Christ did not come, at His first Advent, at a time of a major Hebrew calendar events or feast (such as Passover, Feast of Weeks, or Tabernacles), it was close to one (Hanukkah) but not really on it, and perhaps more like January than December (in our Gregorian Calendar). In the world the event that marked the timing of His arrival was an administrative government gathering called by a Roman Caesar, a census. Can you imagine that, not a religious festival or date of great importance, rather one He created through motivating a Gentile Emperor to count all the people of His empire. This event drew people back to their homes of origin…to the place of their tribe. Sent back home by Government decree, sounds familiar. He is the Lord of all, including time, the Jew and Gentile, the saved, and unsaved, and it more than appropriate He would cut through humanities’ life to pick a moment, creating it from nothing, when He would come to deliver it. Anna, though, just waited and watched, serving the Lord in prayer, and fasting, and in the right moment made known the advent of Christ. May her voice be heard again soon.
Now there were in the same country shepherds living out in the fields, keeping watch over their flock by night. And behold, an angel of the Lord stood before them, and the glory of the Lord shone around them, and they were greatly afraid. (Luke 2:8,9)
Now there was one, Anna, a prophetess, the daughter of Phanuel, of the tribe of Asher. She was of a great age, and had lived with a husband seven years from her virginity; and this woman was a widow of about eighty-four years, who did not depart from the temple, but served God with fastings and prayers night and day. And coming in that instant she gave thanks to the Lord, and spoke of Him to all those who looked for redemption in Jerusalem. (Luke 2:36-38)
“But of that day and hour no one knows, not even the angels of heaven, but My Father only. But as the days of Noah were, so also will the coming of the Son of Man be. For as in the days before the flood, they were eating and drinking, marrying and giving in marriage, until the day that Noah entered the ark, and did not know until the flood came and took them all away, so also will the coming of the Son of Man be. Then two men will be in the field: one will be taken and the other left. Two women will be grinding at the mill: one will be taken and the other left. Watch therefore, for you do not know what hour your Lord is coming. But know this, that if the master of the house had known what hour the thief would come, he would have watched and not allowed his house to be broken into. Therefore you also be ready, for the Son of Man is coming at an hour you do not expect.” (Matthew 24:36-40)
“Let your waist be girded and your lamps burning; and you yourselves be like men who wait for their master, when he will return from the wedding, that when he comes and knocks they may open to him immediately. Blessed are those servants whom the master, when he comes, will find watching. Assuredly, I say to you that he will gird himself and have them sit down to eat, and will come and serve them. And if he should come in the second watch, or come in the third watch, and find them so, blessed are those servants. But know this, that if the master of the house had known what hour the thief would come, he would have watched and not allowed his house to be broken into. Therefore you also be ready, for the Son of Man is coming at an hour you do not expect.” (Luke 12:35-40)
 The New Testament shows no clear link between major Jewish festivals and the time of the birth of Christ.