December 25th, called Christmas Day, is a man-made observance with no support in the Bible.
The date of Christ’s birth is not given in the Bible; neither is there any commandment to celebrate it.
The fact that shepherds were in the fields at night looking after their flocks makes it very unlikely that Jesus was born in late December.
For those who believe the gospel and are baptised into Jesus Christ, just one observance is commanded by Jesus and that is to meet with fellow believers often to share bread and wine in remembrance of his sacrifice.
1 Corinthians 11:23 For I have received of the Lord that which also I delivered unto you, That the Lord Jesus the same night in which he was betrayed took bread: 24 And when he had given thanks, he brake it, and said, Take, eat: this is my body, which is broken for you: this do in remembrance of me. 25 After the same manner also he took the cup, when he had supped, saying, This cup is the new testament in my blood: this do ye, as oft as ye drink it, in remembrance of me. 26 For as often as ye eat this bread, and drink this cup, ye do shew the Lord’s death till he come.
No day or date is specified, only that it should be done ‘often’.
The early church found it convenient to meet on the first day of the week (Sunday) and this became a tradition.
It is the only observance required of those who are in Christ.
All other observances are man-made and should be recognised as having no validity in the worship of God through Jesus Christ.
I hope you find this helpful.