Hellenion’s December 2017 Festival calendar,
from https://www.hellenion.org/calendar/
Poseideon – Poseideon 2
Year 1 of the 699th Olympiad
2 Full moon
9 Libation to Dionysos
18 Dark of the Moon
19 Hekate’s Deipnon
20 Noumenia
21 Agathos Daimon; Heliogenna; Solstice
22 Heliogenna
27 Haloa
29 Country Dionysia
31 New Year’s Eve