Many churches hold special services on Easter Sunday, which celebrate the Jesus Christ's resurrection after his crucifixion. The spring began to be associated with Jesus Christ's crucifixion and resurrection. The crucifixion is remembered on Good Friday and the resurrection is remembered on Easter Sunday.
Since Easter represents the fulfillment of God's promises to mankind, it is the most important holiday on the Christian calendar.
As we know from the Gospels, Jesus Christ rose from the dead on the third day following his crucifixion. His resurrection marks the triumph of good over evil, sin and death. It is the singular event which proves that those who trust in God and accept Christ will be raised from the dead.