Acts 19:29

‘And the city was filled with the confusion, and they rushed with one accord to the theatre, having seized Gaius and Aristarchus, men of Macedonia, Paul's companions in travel.'

They poured out of their meeting and raced in large numbers down the main street which led to the theatre, yelling ‘Great is Artemis of the Ephesians' and harassing people, and as they went, calling them to come to an unofficial assembly. And at one point they came across, and were able to seize, Gaius and Aristarchus, two Macedonians who were working with Paul as companions and assistants. Whether this was by going to where they were staying or from the unfortunate circumstance of their being in the street at the time we are not told. Then they dragged them to the large theatre calling for an informal public assembly to be held (something of which Rome did not approve) so that they could be given rough justice. All were to behold their humiliation.

For Aristarchus, who came from Thessalonica, see Acts 20:4; Acts 27:2; Colossians 4:10; Philemon 1:24. If this Gaius was a Macedonian he was probably not the Gaius in Corinth (1 Corinthians 1:14; Romans 16:23) or the Gaius of Derbe (Acts 20:4). Gaius was a very common name).