'Solemn Assembly' in the Bible

Seven days ye shall offer an offering made by fire to the LORD: on the eighth day shall be a holy convocation to you, and ye shall offer an offering made by fire to the LORD: it is a solemn assembly; and ye shall do no servile work in it.

On the eighth day ye shall have a solemn assembly: in it ye shall do no servile work.

Six days thou shalt eat unleavened bread: and on the seventh day shall be a solemn assembly to the LORD thy God: in it thou shalt do no work.

And Jehu said, Proclaim a solemn assembly for Baal. And they proclaimed it.

And on the eighth day they made a solemn assembly: for they kept the dedication of the altar seven days, and the feast seven days.

Also day by day, from the first day to the last day, he read in the book of the law of God. And they kept the feast seven days; and on the eighth day was a solemn assembly, according to the manner.

Sanctify ye a fast, call a solemn assembly, gather the elders and all the inhabitants of the land into the house of the LORD your God, and cry to the LORD,

Blow the trumpet in Zion, sanctify a fast, call a solemn assembly:

I will gather them that are sorrowful for the solemn assembly, who are of thee, to whom the reproach of it was a burden.