Festival of Weeks. Commemorates the giving of the Torah at Mount Sinai
Torah: Deuteronomy 14:22-16:17; Numbers 28:26-31
Haftarah: Habakkuk 3:1-19
Haftarah for Sephardim: Habakkuk 2:20-3:19
https://hebcal.com/h/shavuot-2027?uc=ical-jewish-holidays-all