'Festival' in the Bible

"I will punish her for the festival days when she burned incense to the Baal idols; she adorned herself with earrings and jewelry, and went after her lovers, but she forgot me!" says the Lord.

They have committed treason against the Lord, because they bore illegitimate children. Soon the new moon festival will devour them and their fields.

So what will you do on the festival day, on the festival days of the Lord?