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Tachanun and eulogies:[1]

Tachanun: Tachanun is omitted from the first day of Sivan until after Shavuos.[2] One is to omit Tachanun until the 12^th of Sivan, including the 12^th of Sivan, [and so is the Chabad custom].[3] [Tachanun is resumed on the 13^th of Sivan.[4] On the Shabbos of these dates, Av Harachamim and Tzidkascha Tzedek is omitted.]

Eulogy/Hesped:[5] One does not say a Hesped on any day that Tachanun is omitted[6] unless the person is a Torah Sage, and his body is present at the time of the Hesped.[7]

Tziduk Hadin:[8] One does not say Tziduk Hadin, or the Kaddish that follows it, on any day that Tachanun is omitted, [unless the person is a Torah Sage[9]].

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[1] Admur 494:20; Siddur Admur; Rama 131:7; 494:3

[2] The reason: The custom is to omit Tachanun from the beginning of Sivan until the 8^th of Sivan. The reason for this is because starting immediately after Rosh Chodesh Sivan, Moshe began dealing with the Jewish people in regard to receiving the Torah [and it is thus considered times of extra joy]. [494:20]

The following are the preparations: [Admur ibid]

1. First of Sivan: On Monday, the first of Sivan, was Rosh Chodesh and hence Tachanun was omitted.
2. Second of Sivan: On Tuesday, the 2^nd of Sivan, Moshe told the Jewish people “You will be for me a Mamleches Kohanim”
3. Third of Sivan: On Wednesday, the 3^rd of Sivan, Moshe told the Jewish people the Mitzvah of Hagbala, to not enter into the vicinity of the mountain during Matan Torah.
4. Fourth and Fifth of Sivan: On Thursday, the 4^th of Sivan, Moshe told the Jewish people the Mitzvah of separating from their wives for the two days of Thursday and Friday and that they should be prepared for the 3^rd day, which is Shabbos on which the Torah was given.
5. 6^th and 7^th day: Is Shavuos.
6. 8^th day: Is Motzei Yom Tov which is called Isru Chag.

[3] Siddur Admur; M”A 131:18; Kneses Hagedola 494:6; Peri Chadash; Elya Raba 494:11; Shulchan Gavoa 494:8; Moed Lekol Chaiy 8:44; Yifei Laleiv 2:6; Hatahor 131; P”M 131 A”A 18; Shaareiy Teshuvah 131:7; M”B 494:36 in name of M”A and P”M; Kaf Hachaim 494:52

The reason: The reason for this is because after Shavuos there is 7 days of Tashlumin for which the Holiday Karban is able to be sacrificed, and therefore we do not say Tachanun until the days of Miluim of the Karban have passed.

Ruling of Admur in Shulchan Aruch and other opinions: In the Shulchan Aruch 494:20 Admur rules that Tachanun resumes on the 9^th of Sivan [in the Diaspora]. So also rules: Rama 131:7; 494:3; Levush 494. Other Poskim rule that one is to omit Tachanun until the 13^th or 14^th of Sivan. [See Kneses Hagedola ibid; P”M ibid; Kaf Hachaim ibid; Shaareiy Teshuvah ibid]

Custom in Eretz Yisrael: According to the Shulchan Aruch, being that in Eretz Yisrael there is only one day of Yom Tov, therefore Tachanun should resume in Eretz Yisrael on the 8^th day of Sivan. However, according to the Siddur, we omit Tachanun until the 13^th. Practically, the custom in Eretz Yisrael is to omit Tachanun until the 12^th of Sivan. [Piskeiy Teshuvos 494:9; Nitei Gavriel p. 221]

[4] Siddur Admur; Likkutei Sichos 28:76 [printed in Shulchan Menachem 3:42]

Other opinions: Some Poskim rule Tachanun is to be omitted in the Diaspora likewise on the 13^th of Sivan due to Sfeika Deyoma. [See Shaareiy Teshuvah ibid]

[5] Megilas Taanis “Pischa Zeira is forbidden in eulogy”; See Michaber 420:1 and 670:3 and Y.D. 401:5; Taz 420:1; M”A 420:1 and 548:8; Admur 429:8 regarding the month of Nissan; Chochmas Adam 169:25 [unlike Chayeh Adam 118:7]; Kaf Hachaim 420:1; Nitei Gavriel Aveilus 52:3

[6] This law if learned from the law brought in Poskim ibid that women do not lament by funerals during these days. It is also learned from the Poskim in next Halacha who prohibit saying Tziduk Hadin on any day that Tachanun is omitted, and if Tziduk Hadin is omitted than certainly a Hesped may not be said. [See Taz ibid that a Hesped is more severe than Tziduk Hadin as Tziduk Hadin is “not a eulogy but recognition and acceptance of the Divine decree” and hence some opinions allow Tziduk Hadin; See also M”A 548:8 that one may not even say praise of the dead because this can lead to a eulogy.]

[7] Michaber Y.D. 401:5; See Admur ibid; Taz and M”A ibid; Chochmas Adam 169:25 [unlike Chayeh Adam 118:7]

[8] Rama 420:2 and Y.D. 401:6; Maharitz Geios; See Kaf Hachaim 420:2

Other opinions: Some Poskim rule that Tziduk Hadin and Kaddish is recited on Lag Baomer being it is not considered a eulogy but merely a blessing to Hashem. [Michaber 420:2; Opinions in Tur 420; Talmidei Rashi; Rambam] Practically, each community is to follow their custom, and in a place where there is no set custom, it is better not to say it. [Kaf Hachaim ibid]

[9] Taz 420:1 that the Rama passed away on Lag Baomer of the year 5333 [שלג] and they were in question as to whether they should say Tziduk Hadin, at which point a prestige Sage stepped forward and stated that he heard from the Rama that one may say Tziduk Hadin on an important Sage, and so he went ahead and said it in a loud voice. [Taz ibid]