About the Mass …
15. The celebration of the eucharist is inseparably bound up with the rite of the dedication of an altar. The Mass is the Mass for the dedication of an altar. On Christmas, Epiphany, Ascension, Pentecost, and on the Sundays of Advent, Lent, and the Easter season, the Mass is the Mass of the day, with the exception of the prayer over the gifts and the preface, which are closely interwoven with the rite itself.
It is possible to dedicate an altar on those listed days, just not with the readings and some of the prayers of the festivity.
16. It is fitting that the bishop concelebrate the Mass with the priests present, especially with those who have been given charge over the parish or the community for which the altar has been erected.