From today’s sunset: Hecate’s Deipna- The end of the month, the Old and New- it is always sacred to the Goddess.
Khalkeia, “a festival at Athens, which some call Athenaia; but others [call it] Pandemos [Whole People], because it is observed by all.” “An ancient [sc. Athenian] festival popular long ago, but subsequently observed by the craftsmen only, because Hephaistos worked bronze in Attica. It is on the last day of the month Pyanepsion; the day when the priestesses, together with the arrephoroi, preserve the peplos.”
The festival is said to commemorate the discovery of the technai: honors to Hephaistos, Athena Archegetis, Athena Ergane and Athena Hephaistia.
The priestesses and the arrephoroi set the warp in the loom for the weawing of Athena’s sacred peplos.
(cf. Suda s.v. Chalkeia; Harp. s.v. Chalkeia; Etym. Magn. 805.43; Eust. Il. 2.552; Pollux 7.105; Hesych. s.v. Chalkeia; Soph. fr. 844; Agora XV 70.7, 78.16, 253.9; ARV2 553.31; Athen. 11.502)
“the thirtieth we celebrate in Hades because of Hecate” – ie , the thirtieth day of the month (if present, otherwise the 29th, which is, in any case, called ‘thirtieth’) is honored Hecate as it is the last day of the month and at the same time, we also honor the dead (in fact, in its calendar, Pletho dedicated the twenty-ninth day to Pluto). “The image of Hecate is erected and consecrated at the crossroads, and rites in honor of the dead have been made on the thirtieth day.”
The last day of the month must be also devoted to meditation and to the reconsideration of the work done during the month, as well as to the preparation for the new month to come. In any case, no one should undertake an important work during this last day. It is highly recommended to fast for the whole day (for example, this was the habit of Proklos).
(The creation of Anesidora (Pandora) by Athena and Hephaistos; Ca. 470—460 B.C. found in Nola, now in the British Museum…)