throng in

throng in(to something)

[for a crowd] to swarm into some place. The eager crowd thronged into the department store to partake in the advertised sale. The doors opened and they thronged in.
See also: throng
References in classic literature ?
Among the rest there was a group of those merry imps, who, after smashing the glass in a window, had seated themselves hardily on the entablature, and from that point despatched their gaze and their railleries both within and without, upon the throng in the hall, and the throng upon the Place.