The people of God are set apart, with different priorities, habits, and festivals than the rest of the world. We may celebrate national holidays of our homelands, such as July 4th for Americans, but those are not the observances that shape our identities as God’s people. The kingdom we belong to under Christ’s authority has a different calendar.
A couple months ago, I read Desiring the Kingdom by James K.A. Smith. In Chapter 5: Practicing (for) the Kingdom, he discusses “rhythms and cadences of hope” that Christians observe in weekly and annual practices. For him, this means Sunday, Easter, Lent, Advent, Christmas and others. He connects the observances to a rich history of “a people gathered to worship the Messiah, who does not float in some esoteric, ahistorical heaven, but who made a dent in the calendar — and will again” (p. 157). 
But when you read the Bible, you won’t find those days he talks about on God’s calendar. Even the one mention of Easter in the KJV is a mistransltion of pascha, or Passover (Acts 12:4, Strong’s G3957). Rather, we find the church from the Torah to Revelation on a calendar even more unique than the one Smith claims for Christians. I know it puzzles many Christians that I would keep the “Jewish holidays,” but I find it equally puzzling that they would continue a tradition of co-opting pagan holidays and attaching them to Biblical events God gave no instructions to observe. When we search the scriptures looking for God’s version of liturgical rhythms, we find a worship pattern far more richly layered and deeply rooted in God’s plan than what man has invented. Read more
Like An Anchor 