#Where did the people make their tents to celebrate the festival?

The people made their tents on their own roofs, in their courtyards, in the courts of the house of God, in the open place by the water Gate, and in the square at the Gate of Ephraim. [8:16-17]

#When was the last time the people of Israel had obeyed the command of Yahweh to celebrate the festival?

The last time the festival had been celebrated was in the days of Joshua the son of Nun. [8:17]