Where does “ψαραγορά” come from?

ψαραγορά (Greek) comes from Greek αγορά, from Ancient Greek ἀγορά, from Ancient Greek ἀγείρω, from Proto-Hellenic agéřřō, from Proto-Indo-European h₂ger- — to gather; flock, herd.

ψαραγορά (Greek): fishmarket