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May one visit a cemetery during Chanukah?
One is not to visit a cemetery during Chanukah. This applies even if one desires to visit the grave of a relative at the conclusion of Shiva, Shloshim or a Yartzite. Rather, he is to go before Chanukah. [However, there are those who are lenient in this matter, and so is the prevalent custom.]
Erev Chanukah: One may visit a cemetery on Erev Chanukah. Hence, if a Yartzite falls on Chanukah, one is to go to the grave on Erev Chanukah.
Kivrei Tzaddikim: According to all, one may visit the graves of Tzaddikim during Chanukah.
 Ben Ish Chaiy Vayeishev 22; Kaf Hachaim 670:23; Piskeiy Teshuvos 670:1
 The reason: As one is not to say a eulogy during Chanukah, and by going to the gravesite one arouses mourning.
 Brought in Piskeiy Teshuvos 670:1
 Gesher Hachaim 1 p. 259
 Ben Ish Chaiy ibid; Poskim ibid