Sukkot
The Festival of Sukkot begins on Tishri 15, the fifth day after Yom Kippur. It is quite a drastic transition, from one of the most solemn holidays in our year to one of the most joyous. Sukkot is so unreservedly joyful that it is commonly referred to in Jewish prayer and literature as Z'man Simchateinu Z'mn Simchateinu (in Hebrew), the Season of our Rejoicing.
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