This is Gods 7th and last Feast its called the "Season of our Joy". Shortly after Yom Kippur people joyously celebrate God's love and provision.
Sukkot means booths and during this time the Hebrews slept in booths or shelters. Since it is the 7th feast and seven is the number for completion this feast represents the completed or finished work Jesus completed. This is the instruction the Lord gave during the Feast of Tabernacles: In Biblical days the shepherds erected booths for livestock in Genesis 33:17. Soldiers stayed in booths in 2 Samuel 11:11. Farmers stayed in booths Isaiah 4:6. It was celebrated again in Zechariah 14:16 and references the importance of reverence. Cains offering was rejected because he failed to show reverence.