Each Shabbat during Chol HaMoed, the "intermediate days" of Passover and Sukkot, is known as Shabbat Chol HaMoed ("[the] Shabbat [of the] intermediate days" שבת חול המועד) which occurs up to twice a year during the week-long festivals.
The Shabbat during Chol HaMoed on Sukkot is known as Shabbat Chol Hamoed Sukkot and in addition to the designated Torah reading, maftir, and haftorah readings for that day, Ecclesiastes (Kohelet) is read aloud in synagogue in its entirety with special cantillation prior to the Torah reading during services.