It is a festival in Athens held in the month of Anthesterion.[1] They say that the festival came about thus, when Orestes, after killing his mother, came into Athens and [the] Athenians welcomed him and entertained him; but they did not share their wine with him; instead, the people set aside a pitcher for him and entertained him this way -- having apportioned a little aside for Orestes.
And otherwise[2]: Pitchers [is] a festival at Athens, [instituted] for this reason; Orestes, after the killing of his mother, came into Athens to [the house of] Pandion, his kinsman settled there, who happened to be king of the Athenians. He encountered him in the act of celebrating a festival at public cost. So Pandion, ashamed to send Orestes away, yet thinking it impious to share drink and table [with him] as he had not been purged of the murder, set out one pitcher for each of the invited guests, so that [Orestes] would not drink from the same bowl.