Zephaniah 2:1 & 2
Gather together, gather together, O shameful nation, before the appointed time arrives and that day sweeps on like chaff, before the fierce anger of the Lord comes upon you, before the day of the Lord's wrath comes upon you.
What a wonderful picture of God's mercy as this chapter opens with a final call for God's people to assemble together. So that brings us to the question of what the people were to do when they assembled and the answer is that they were to worship and call upon the name of the Lord. This reminds us that, as the times get tougher and tougher, we are to assemble and call upon the name of the Lord.