Throng (verb) اجتماع، ہجوم، مجمع

(of a crowd) fill or be present in (a place or area).
Example: “a crowd thronged the station”
Complacency (noun) اطمینان

a feeling of smug or uncritical satisfaction with oneself or one’s achievements.
Example: “the figures are better, but there are no grounds for complacency”