'Solemn Assembly' in the Bible

The roads to Zion mourn, because no one comes to the solemn assembly; all her gates are desolate, her priests groan: her virgins are afflicted, and she herself is in bitterness.

The Lord has rejected all my mighty men in my midst; he has called a solemn assembly against me to crush my young men. The Lord has trodden as in a winepress the virgin daughter of Judah.

He has done violence to his temple, as if it were a garden; he has destroyed his place of assembly. The LORD has caused solemn assembly and Sabbath to be forgotten in Zion. He has spurned in his fierce anger the king and the priest.

The Lord has rejected his altar, he has disowned his sanctuary, and has given up into the hand of the enemy the walls of her palaces. They have made a shout in the house of the LORD, as in the day of a solemn assembly.

You have called, as in the day of a solemn assembly, my terrors on every side. There was none that escaped or remained in the day of the LORD's anger. Those that I have borne and brought up has my enemy destroyed.