assembled
v.v. to put different parts together to make a whole thing, or to gather a group of people in one place. You use this when building furniture or calling a meeting.
v. to fit together the separate component parts of a machine or structure; to bring people or things together as a group. Transitive when referring to construction; can be used intransitively when a group gathers.
He assembled the new bookshelf in less than an hour.
The manager assembled the entire team in the conference room to announce the new policy.
Once the engineers had assembled the prototype, they began a rigorous series of stress tests to ensure the structural integrity of the frame under extreme pressure.
The verb is primarily transitive, requiring a direct object, but can function intransitively when describing a crowd gathering in a location.