6. Hesped before a Holiday: [1]

If one passed away prior to thirty days before a festival [i.e. Pesach, Sukkos, Shavuos] it is forbidden for a relative to eulogize him within thirty days of the festival.[2] This applies even if the relative finds someone to eulogize for free.[3] [This applies only towards the Shalosh Regalim, and not to the thirty days before Rosh Hashanah and Yom Kippur.[4]] It is however permitted to eulogize someone who passed away within thirty days before the festival, even on Erev Chag.[5] It is likewise permitted to eulogize a Shemua Kerova/Rechoka within thirty days before the festival.[6] However, even in the case that one is in any event giving a eulogy on behalf of a relative who passed away within thirty days before the festival, it is forbidden to also eulogize the relative who passed away prior to thirty days before the festival.[7]

Yahrzeit commemoration within thirty days before the festival, and on a festival:[8] It is permitted to commemorate the Yahrzeit of a relative and eulogize him within thirty days before a festival.[9] [This applies even by the first Yahrzeit, and is permitted to be done even within the holiday.[10]]

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[1] Michaber Y.D. 347:1; O.C. 547:3; Moed Katan 8

[2] The reason: As the re-aroused emotions of a loss remain within oneself for thirty days, and this can lead one to eulogize the deceased during the Holiday. Alternatively, it can lead one to spend the money set aside for the Holiday for eulogy expenses. [Taz 547:1; First reason is Shmuel in Gemara, 2^nd reason is Rav in Gemara]

[3] Taz ibid, as we rule like Shmuel, however according to Rav, it is permitted for a relative to hire a Rabbi to eulogize for free

[4] Agudas Eizov 6, brought in Pischeiy Teshuvah 347:1

[5] The reason: As the relative is in any event emotionally aroused due to the loss and no new emotion is added due to the eulogy. [M”A 547:1]

[6] Michaber Y.D. 347:2; O.C. 547:4

The reason: As the pain of the passing is already aroused due to the newly discovered information of the death, and it is hence no different than a relative who passed away within thirty days of the festival. [Taz 547:2]

[7] Michaber Y.D. 347:1; O.C. 547:3; Raavad

[8] Michaber Y.D. 347:1; O.C. 547:5

[9] The reason: As this signals the end of the mourning period. [M”A 547:2; Taz 547:3; Beis Yosef 547; Beis Hillel Y.D. 347]

[10] Shach 347:2 in name of Levush