Convene, v.t. To summon judicially to meet or appear. —Webster's 1828 American Dictionary of the English Language
Where there is no court among God's people to hear matters of controversy at divine law, there is no justice and therefore no governmental arm of America's unseen King.
In other words, any group calling itself a "XYZ Church", is a bureaucratic counterfeit and not the authentic body of the King's men and women summoned to govern and rule in the midst of the King's enemies.