Why Paul and other disciples, even Mary and brother in the flesh of our Lord, who knew exactly about the date, why we were not told that they remembered His first advent on a yearly basis?
And why they were not led to make observance surrounding that day when they are the one being led by the Spirit of the Lord?
Which one do you celebrate most? Is it the Christmas or the Christ of your Christmas?
Will you show me any basis in the Bible for celebrating it?