'Festival' in the Bible

David said to Jonathan, “Behold, tomorrow is the New Moon [observance], and I should sit at the table to eat [the sacrificial meal] with the king; but let me go, so that I may hide myself in the field until the third evening.

Then Jonathan said to David, “Tomorrow is the New Moon [festival], and you will be missed because your seat will be empty.

So David hid in the field; and when the New Moon [festival] came, the king sat down to eat food.

But the next day, on the second day of the New Moon, David's place was empty, and so Saul told his son Jonathan, "Why didn't Jesse's son come to the festival, either yesterday or today?"

Abigail returned to Nabal, and he was there in his house holding a festival like the festival of a king. Nabal's heart was glad, and he was very drunk, so she didn't tell him anything at all until morning.