15 MENACHEM AV.
The Mishna in Taanis refers to this date as one of the most joyous of the year. the Gemara gives many reasons for this. Chassidus sees this day as the answer to Tisha BiAv.
15 Menachem Av.
The Mishna considers this day one of the happiest in the Jewish calendar, comparing it to Yom Kippur. The Gemara lists many explanations for this, and there's still more.
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