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The Magid’s yartzeit, and it’s connection to the Chag Hageulah is a focal point in all the Rebbe’s sichos on the subject as well as a cliche talking point in practically every 19 Kislev farbrengen.
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Yes, it’s true that I haven’t been to a Yat Kislev Farbrengen, but you do seem to portray the Yahrzeit as a point of the story of the Bal Hatanya’s redemption, not quite a celebration of the Maggid’s Yahrzeit itself.