throng around someone or something
to crowd around someone or something. The children thronged around the lady with the bags of candy. Everyone thronged around the piano for the group sing.
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.
throng out (of something)
[for a crowd] to swarm out of something or some place. The people thronged out of the concert hall at the end of the program. At half past ten, the crowd thronged out.