It has been practice around the world to celebrate Christmas, Good Friday and Easter from centuries as for some it has become religious festival, for some holiday seasons and so on… The question arises among believers how do we need to look into these occasions? The first truthful understanding to be considered that salvation or christian-life is not merited on celebrating any of these festivals nor lost by rejecting them, but it is a day kept aside for Lord and more over an opportunity to speak of Christ and to show identity and purpose of His will to the people on other end (unbelievers), as people tend to be more open to the gospel during the those holidays and we should take advantage of that openness to witness to others of the saving gospel of God through Jesus Christ.
Scripture doesn’t specifically command believers to celebrate Christmas nor there are any prescribed holydays,
Christmas was not observed as a holiday until well after the biblical era, wiki records the first date of Christmas being celebrated was on December 25th in 336 AD, during the time of the Roman Emperor Constantine (he was the first Christian Roman Emperor) and then it wasn’t became popular until the mid-fifth century that Christmas received any official recognition. No one knows the real birthday of Jesus! No date is given in the Bible so Christmas is rejected by many Christians calling paigan because of its root and of modern spoiled business appearances as "santa, Christmas-tree, gifts exchange and many more", we clear understand that it's all about Christ not you or me and when we celebrated to remember the birth of Jesus Christ? remember that we're celebrating a real event that happened about 2000 years ago, that God sent his Son into the world as a lamb for our sins!
Paul emphasises on the same theme saying,
One person esteems one day above another; another esteems every day alike. Let each be fully convinced in his own mind. He who observes the day, observes it to the Lord; and he who does not observe the day, to the Lord he does not observe it. He who eats, eats to the Lord, for he gives God thanks; and he who does not eat, to the Lord he does not eat, and gives God thanks (Rom. 14: 5-6).
So we set aside a day for lord and remember those days as reminders of great truths of Christ's love showed to us (1 Corinthians 11:25; 2 Peter 1:12-15; 2 Thessalonians 2:5).
Truth needs repetition because we so easily forget it. We should celebrate these Christian festivals as remembrance and share truth with friends, family and neighbours.
John MacArthur puts in this way,
Although our society has muddied the message of Christmas through consumerism, myths and empty traditions, we should not let these distract us from appreciating the real meaning of Christmas. Let us take advantage of this opportunity to remember Him, worship Him and faithfully witness of Him.
As spreading gospel is not restricted only on special days but needs to take advantages of all possible occasions in our day to day life.