The Jews participated in many festivals in which they celebrated a variety of different things, in order to remember specific events which happened throughout their history, all of which were commanded by God.
To some in Christendom, the most important Christian holiday is Easter, a spring holiday that celebrates Christ’s resurrection from the dead. To others in Christendom, the most important Christian holiday is Christmas, which they believe commemorates the birth of Jesus on December 25th. It’s amazing how church buildings all of a sudden fill up with people only when these two dates come along!
"But God demonstrates his own love for us in this: While we were still sinners, Christ died for us."