'Assembly' in the Bible

Solomon and all Israel with him—a great assembly, from the entrance of Hamath to the Brook of Egypt—observed the festival at that time in the presence of the Lord our God, seven days, and seven more days—14 days.

They summoned him, and Jeroboam and the whole assembly of Israel came and spoke to Rehoboam:

When all Israel heard that Jeroboam had come back, they summoned him to the assembly and made him king over all Israel. No one followed the house of David except the tribe of Judah alone.