On the 21st of May, the Hellenic Kallynteria festival is observed.
The Kallynteria is a festival in which the temple of Athena was swept out, her lamps refilled and lit by her Athenian priestesses.
This is an auspicious time to clean and reset up your shrines or working altars to the gods – specifically Athena.
Offer olive branches or olive oil.
(C) T. Georgitsis