Why Do We Celebrate 15 Av?

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The Talmud states: "Never were there more joyous days for the Jewish People than the 15th of Av and Yom Kippur," listing five or six joyous events that occurred on 15 Av throughout history.
But what is it about the energy of the 15th of Av that attracts so much joy?
15 Menachem Av, 5743 · July 25, 1983
From Living Torah Disc 91 Program 362

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Thanks for the translation.