Dantes was tossed about on these doubts and wishes, when the patron, who had great confidence in him, and was very desirous of retaining him in his service, took him by the arm one evening and led him to a tavern on the Via del’ Oglio, where the leading smugglers of Leghorn used to congregate and discuss affairs connected with their trade.
There are no more uses of "congregate" in the book.
Show samples from other sources
People congregated outside of City Hall to protest.
It was in the quiet at the end of the day, when we began to congregate in the open space before climbing into our caves.