Hoshana Rabba

'If atonement is not granted on Rosh Hashana, I will grant it on Yom Kippur, and if they do not attain atonement on Yom Kippur, I will grant it on Hoshana Rabba.'

The word "Sukkot" means "huts" or "booths", referring to the booth-like structures that Jews are to eat their meals in over the course of the holiday, and preferably to sleep in too!