Simchat Torah

Shemini Atzeret is also the holiday of Simchat Torah. They are celebrated on the last day of Sukkot.

For seven days present offerings made to the LORD by fire, and on the eighth day hold a sacred assembly and present an offering made to the LORD by fire. It is the closing assembly; do no regular work.
Leviticus 23:36

On the eighth day hold an assembly and do no regular work.
Numbers 29:35

This is the day on which you begin to pray for rain for Israel and it marks the approaching of winter. During the six months of summer no rain falls.

This holiday marks the completion of the annual cycle of weekly Torah readings. Each week in synagogue we publicly read a few chapters from the Torah, starting with Genesis Ch. 1 and working our way around to Deuteronomy 34. On Simchat Torah, we read the last Torah portion, then proceed immediately to the first chapter of Genesis, reminding us that the Torah is a circle, and never ends.

On Simchat Torah there are processions around the synagogue carrying the Torah scrolls and plenty of high-spirited singing and dancing in the synagogue with the Torahs and the joy is high.