'Solemn Assembly' in the Bible

The roads to Zion are in mourningBecause no one comes to the appointed feasts.All her gates are desolate;Her priests are groaning,Her virgins are grieved and suffering,And she suffers bitterly.

You [Lord] called as in the day of an appointed feastMy terrors (dangers) on every side;And there was no one who escaped or survivedIn the day of the Lord’s anger.Those I have cared for and brought up with tenderness,My enemy annihilated them.