The Octave of Easter is the eight-day period, or octave, that begins on Easter Sunday and ends with Second Sunday of Easter.[1] It marks the beginning of Eastertide. The first seven of these eight days are also collectively known as Easter Week.
The Octave of Easter is celebrated with daily Mass. The Lutheran Missal states:[3]
The Octave of Easter forms a cohesive thematic unit with the two following weeks. The Gospel for Quasimodogeniti, the First Sunday after Easter, recounts the appearance of Our Lord to the apostles in the locked upper room, together with Thomas’ confession.[3]