Hellenion's December 2016 Festival calendar,
from http://www.hellenion.org/calendar.html
Poseideon - Gamelion
Year 4 of the 698th Olympiad
1 Noumenia
2 Agathos Daimon
8 Poseidea
10 Libation to Dionysos; Country Dionysia
13 Full Moon
18 Winter Solstice
21 Heliogenna
22 Heliogenna
26 Haloa
29 Dark of the Moon
30 Hekate’s Deipnon
31 Noumenia; New Year’s Eve