380. Among the Masses for the Dead, the Funeral Mass holds first place. It may be celebrated on any day except for Solemnities that are Holydays of Obligation, Thursday of Holy Week (Holy Thursday), the Paschal Triduum, and the Sundays of Advent, Lent, and Easter, with due regard also for all the other requirements of the norm of the law.
General Rubrics of the Roman Missal 393.
Any Mass of the dead whatsoever, including the funeral Mass, is prohibited:
a) in churches and oratories where for any reason there is exposition of the Blessed Sacrament, for the whole time of the exposition; the Masses on the day of the commemoration of All the Faithful Departed are excepted (no. 352);
b) in churches having only one Mass, whenever there is an obligation of a conventual Mass which cannot be satisfied by another priest; unless the conventual Mass itself must be said or may be said for the departed;
c) in churches having only one Mass, on February 2 and on Ash Wednesday, if there is the blessing of candles and of ashes respectively; and on the greater and lesser litanies, if the Mass of the rogation is to be said.
245 Except on solemnities, Sundays of Advent, Lent and Eastertide, Ash Wednesday, during Holy Week and during the octave of Easter, and on 2 November,
a votive Office may be celebrated either in whole or in part for a public or devotional reason: for example, at the time of a pilgrimage, on a local feast, or during the external solemnity of a saint.
No suggestion of restriction of times and seasons.18. Office of the Dead (Defunctorum officium)
A partial indulgence is granted to the faithful, who devoutly recite Lauds or Vespers of the Office of the Dead.
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