Acts 19:39

εἰ δέ τι περὶ ἑτέρων ἐπιζητεῖτε, but if ye seek anything about other matters. The ‘seeking’ alluded to is by a legal process. If the matter were of such a character as to come before the proconsul, there he was, ready to hear the cause. It was, as we might say, ‘assize time.’ But if the question was of another kind, one for the jurisdiction of the ordinary city courts, then they could apply at the proper time and place.

ἐννόμῳ ἐκκλησίᾳ, in the regular assembly. There were no doubt legally fixed days and times for the city courts. To these it is that the allusion is made.

Chrysostom explains: ἔννομον ἐκκλησίαν φησί, διότι τρεῖς ἐκκλησίαι ἐγίνοντο κατὰ νόμον καθ' ἕκαστον μῆνα.