Chanukah

The conclusion of the blessing before lighting the Menorah is “le-hadlik ner Chanukah,” in keeping with the custom of the ARI zal. The initial letters of these three words spell the Divine Name “NaCHaL” (literally “river” or “brook”). Reb Noson homiletically relates this to the “Nachal Novea Mekor Chokhmah (A Flowing Brook, the Source of Wisdom),” a euphemism for the Rebbe. (The initial letters of this phrase from Proverbs 18:4 spell the name “Nachman.”)
(Cf. Rabbi Chaim Vital, Pri Eitz Chaim, Sha’ar Chanukah, chapter 4, which explains that this Divine Name brings about an outflow of the supernal light of Binah to Ze’er Anpin; Reb Noson relates this to “Nachal Novea Mekor Chokhmah” in Likkutei Halakhos, Betziyas ha-Pas 5:27; ibid. Kiddushin 2:3)

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Shabbos Chanukah was one of the three fixed times during the year when the Chassidim used to come to the Rebbe during his lifetime. In commemoration of this, many Breslover Chassidim today travel to Uman for Shabbos Chanukah. However, the only time of year when it is obligatory for a Breslover Chassid to come to the Rebbe is Rosh Hashanah.
(Note Part II on this topic that some Breslover leaders disapprove of leaving one’s family on Chanukah.)