May one distribute the charity for Yizkor already before Yom Tov?
Yes. Some are accustomed even initially to already distribute the charity before Yom Tov, and then say in the Nussach “As I have given.”[1]]
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[1] Gesher Hachaim 31:2-3; Nitei Gavriel 79:29
What comes first; Yizkor or the prayer of Sissu Vesmicha in Eretz Yisrael on Simchas Torah?
In Eretz Yisrael, Yizkor takes place after the recital of Sisu Vesimcha, prior to the recital of Ashreiy.[1]
[1] Luach Kolel Chabad; Hiskashrus 844 for Simchas Torah with explanation in footnote 85-86; Luach Devar Beito that so is Minhag Chabad; New Siddur Tehilas Hashem
Other customs: Many communities in Eretz Yisrael are accustomed to recite Yizkor immediately after the blessings of the Haftorah, prior to reciting Sisu Vesimcha.
Why do we mention dreams in middle of Birchas Kohanim on Yom Tov?
As this is an auspicious time for our bad dreams to be transformed into good and blessing.
See Siddur Admur; Admur 130:1; Michaber 130:1; Brachos 55b; Ketzos Hashulchan 23:14
Is it true that the Mittler Rebbe only agreed to receive an Aliyah once a year by Kol Hanearim?
Yes, this is true, however, only from after the Alter Rebbe passed away. During the Alter Rebbe’s lifetime, he did receive Aliyos.
See Beis Rebbe p. 2; Yimei Melech 3 p. 1045; Otzer Minhagei Chabad p. 382
If one read the wrong portion of the Karban during Musaf of Sukkos, does he fulfills his obligation.
Yes. [1] If one read the wrong portion of the Karban during Musaf, he nevertheless fulfills his obligation.
[1] M”B 488:13 in name of Chayeh Adam; Piskeiy Teshuvos 663:1