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100. The celebration of Easter is prolonged throughout the Easter season. The fifty days from Easter Sunday to Pentecost Sunday are celebrated as one feast day, the “great Sunday”. (Cf. General Norms for the Liturgical Year and the Calendar 22)
Fifty are obviously more and greater than eight. In some quarters, I do read of the lament of the loss of the Pentecost Octave, but the last day of Easter actually gets a promotion with being the crown and conclusion of one “great Sunday.”
And we know that Sundays of Easter rank above any possible liturgical observance. Except Ascension when it is transferred:
101. The Sundays of this season are regarded as Sundays of Easter, and so termed, and they have precedence over all feasts of the Lord and over all solemnities. Solemnities that fall on one of these Sundays are anticipated on the Saturday. (Cf. Ibidem 5, 23) Celebrations in honor of the Blessed Virgin Mary or the saints which fall during the week, may not be transferred to one of these Sundays. (Cf. Ibidem, 58)