All 3 Uses

congregation
in
I Heard the Owl Call My Name
(Auto-generated)

He knew that unless he wanted to stand by the golden eagle on a winter Sunday and watch his congregation freeze between the "dearly beloved brethren" and the blessing, he must manage somehow to nail plywood over the bare studding and insulation behind it.†
Chpt 1.4

congregation = people who worship together in the same building
On the very first hymn he found he must never for an instant let go of a high note because if he did, his congregation would sink an octave and never come up again.†
Chpt 1.4
Then he ... went to the church where the congregation was waiting.
Chpt 1.7 *

Definitions:

(1) (congregation as in: the congregation voted)
people who worship together in the same building
(2) (meaning too rare to warrant focus)
Much more rarely, congregation can reference any group of people, animals, or things collected together.