[Almanac]: Easter is the most important feast day on the Christian calendar.
Regularly observed from the earliest days of the Church, Easter celebrates Christ’s resurrection from the dead, following crucifixion. It marks the end of Holy Week, the end of Lent, and the last day of the Easter Triduum (starting from the evening of Maundy Thursday, through Good Friday, Holy Saturday, and Easter Sunday), as well as the beginning of the Easter season of the liturgical year.