'Celebrate' in the Bible

but they had been unable to celebrate it then because not enough priests had consecrated themselves and the people had not yet been gathered together in Jerusalem.

so they published a decree that was circulated throughout Israel from Beer-sheba to Dan that they are to come celebrate the Passover to the LORD God of Israel in Jerusalem. The Passover had not been celebrated in great numbers as was being prescribed by the decree.

After this, the whole assembly agreed to celebrate for another seven days, and so they did and they were very happy to do so!

That's how the LORD's service was prepared that day to celebrate the Passover and to offer burnt offerings on the LORD's altar according to what King Josiah had commanded.