From Hellenion’s 2020 Calendar:
Poseideon – Poseideon 2 (Year 4 of the 699th Olympiad) – Libation to Dionysos 12, Poseidea 13; Dark of the Moon 14; Hekate’s Deipnon 15; Noumenia 16; Agathos Daimon 17; Helliogenna 21 & 22; Country Dionysia 25; full moon 29;