We'll cook another big dinner in April when we celebrate a death.
But Christmas is really a celebration of Jesus' entire life and ministry and death and resurrection and ascension. It's really a celebration of Him coming to do the will of His Father (John 12:27-30) and save His people from the power of sin (1 John 3:5-8). It's really a celebration of Him becoming human to save humans.
Jesus came for us. As John Piper puts it,
"Don't leave Christmas in the abstract. Your sin. Your conflict with the Devil. Your victory. He came for this."
Christmas is about a manger, yes, but it's about so much more than just a manger.
It's about how everything wrong in this world is going to be fixed. It's about God's faithfulness. It's about suffering. It's about trusting God even when it hurts. It's about believing in the promise of Immanuel - God with us.
Christmas is about God. But it's also about you.
It's about you trusting in God and worshiping God and glorifying God because Christmas was His rescue mission to save sinners like you.