The seventh, and final festival given to Israel, also known as Feast Of Tabernacles.
Sukkot is celebrated in the fall from Tishrei 15-21st. During this time, families construct a Sukkah ( Huts) and eat their meals in it during this festival. Many will sleep in the Sukkah during this festival.
This commanded festival is to remember that the LORD made the children of Israel live in Sukkah ( Huts), during their journeys through the wilderness for 40 years.