Feast of Booths. Also called the Feast of Tabernacles, the seven-day holiday is one of the Three Pilgrimage Festivals (Hebrew: שלוש רגלים, shalosh regalim)
Torah: Numbers 29:26-34, 29:26-31
https://hebcal.com/h/sukkot-2031?uc=ical-jewish-holidays-all