Eighth Day of Assembly. Immediately following Sukkot, it is observed as a separate holiday in the Diaspora and is combined with Simchat Torah in Israel
Torah: Deuteronomy 14:22-16:17; Numbers 29:35-30:1
Haftarah: I Kings 8:54-66
https://hebcal.com/h/shmini-atzeret-2030?uc=ical-jewish-holidays-all