What is "chalceia"

The Chalkeia festival (also spelled Chalceia), the festival of Bronze-workers, was a religious festival devoted to the goddess Athena. It was celebrated on the last day of Pyanopsion (October or November on the Attica calendar). The festival celebrated Athena Ergane and Hephaestus, in honor of both gods as patron deities of Athens, and as deities of handicrafts.

Each year, preparations are begun for a specialized peplos (a robed garment worn by Greek women) which is made to be offered to the goddess at another festival, the Panathenaea.