Do We Really Need to Keep the Feast of Unleavened Bread?

The annual festivals pictured events of historic importance to ancient Israel, and today to the true Christian. Recall that when God revealed His weekly Sabbath to the Israelites, it was a sign and a memorial so they would remember that He is the Creator and that they were His people.  And God also gave them the annual festivals for His Church showing the plan of God in eventually delivering the entire world from sin.