Final answer:
Chol Hamoed is the term for the intermediate days of a festival, specifically during Passover and Sukkot in the Jewish calendar. These are special days where some work is allowed, but the festive spirit is preserved.
Step-by-step explanation:
Chol Hamoed refers to the c) intermediate days of a festival in the Jewish calendar. Specifically, it occurs during the festivals of Pesach (Passover) and Sukkot, which each last for seven or eight days, depending on Jewish tradition and geographic location. Chol Hamoed represents the days between the initial and concluding days of these festivals, where certain types of work are permitted but the festive atmosphere is maintained. During Chol Hamoed, traditional observances include special prayers, holiday meals, and enjoying family outings or other leisure activities, all while reflecting the combined spirit of both festival and non-festival days.