Christmas (”Christ’s Mass” or “Celebration”) is just that — a celebration of the birth of Christ. Since the exact date of His birth is not known, an arbitrary date was chosen for the event. It is NOT the DAY we celebrate but the EVENT itself. And, more precisely, the salvation it brought — and continues to bring — to mankind.
The date itself is meaningless.
Since the exact date of His birth is not known, an arbitrary date was chosen for the event.
Not really random, though the reasoning is not something we'd use today.