Αθήνα,Ναός Ηφαίστου εσωτερικό - Athens,Hephaestus Temple interior 

On the last day of the same month began the festival which Hephaestus and Athena shared in common, the Chalkeia. This day was celebrated like a wedding: the artisans presented grain swingles to the Goddess. The secret of this festival was not given away, with the result that more stories were told about it, such as that Athena was given to Hephaestus and placed in a chamber for him, or that he followed her and embraced her. All variations allow the Goddess to leave the embrace a virgin, but they allow a child to originate nine month latter from this same embrace.
Only in a later period was the festival of Chalkeia - named such after the material and art of the founders and smiths - celebrated exclusively by artisans as though it were a festival of Hephaestus. Earlier it belonged among the most important festivals of Athena and was called Athenaia.