Shemini Atzeret and Simchat Torah are often thought of as the eighth and ninth days of Sukkot, but they comprise a holiday separate from Sukkot, which lasts seven days, and in Israel, they're observed on the same day.
Congregations read the very end of the Torah and begin again with the first verses of Genesis.
The holiday is marked by singing and dancing, similar to that of a wedding. Just as a bride and groom dance with each other at a wedding, on Simchat Torah we hold the Torah in our arms and dance joyously. The scene becomes a joyous pandemonium of adults and children alike marching, dancing, singing, shouting, and waving flags. In a liberal synagogue, the reading of the end and the beginning of the Torah may be combined in a single service. Their 30-minute performance will consist of contemporary and pop Israeli music, sung mostly in Hebrew.