Sukkot is a Torah-commanded holiday celebrated for seven days, beginning on the 15th day of the month of Tishrei. It is one of the Three Pilgrimage Festivals on which Israelites were commanded to make a pilgrimage to the Temple in Jerusalem. Originally a harvest festival celebrating the autumn harvest, Sukkot’s modern observance is characterized by festive meals in a sukkah, a temporary wood-covered hut, celebrating the Exodus from Egypt.

Shemini Atzeret is a Jewish holiday. It is celebrated on the 22nd day of the Hebrew month of Tishrei in the Land of Israel, and on the 22nd and 23rd outside the Land, usually coinciding with late September or early October. It directly follows the Jewish festival of Sukkot which is celebrated for seven days, and thus Shemini Atzeret is literally the eighth day. It is a separate—yet connected—holy day devoted to the spiritual aspects of the festival of Sukkot. Part of its duality as a holy day is that it is simultaneously considered to be both connected to Sukkot and also a separate festival in its own right.