Hellenic Holidays and Festivals
The Lunar Months
Hekatombaion...July
Metageitnion...August
Boedromion...September
Pyanopsion...October
Maimakterion...November
Poseideon...December
Gamelion...January
Anthesterion...February
Elaphebolion...March
Munikhion...April
Thargelion...May
Skirophorion...June
Each month begins at sunset on the evening when the new crescent moon is visible and continues through the following new moon.

Festivals
Kronia(12 Hekatombaion)...Honoring Kronos
Panathenaia(28 Hekatombaion)...Honoring Athena
Eleusinion(15-22 Boedromion-Often called the Eleusinian Mysteries)...Honoring Demeter and Persephone
Pyanapsia(7 Pyanepsion)...Honoring Apollon
Oskhophoria(7 Pyanepsion)...Honoring Dionysos
Thesmophoria(11-13 Pyanapsion)...Honoring Demeter
Apaturia(Date in Pyanepsion determined by each Demos)...A family celebration
Khalkeia(30 Pyanepsion)...Honoring Athena and Hephaistos
Haloa(26 Poseideon)...Honoring Demeter and Dionysos
Country Dionysia/Lenain(Date in Poseideon determined by each Demos)...Honoring Dionysos
Anthesteria(11-13 Anthesterion)...Honoring Dionysos
Diasia(23 Anthesterion)...Honoring Zeus
City Dionysia(9-13 Elaphebolion)...Honoring Dionysos
Thargelia(6-7 Thargelion)...Honoring Artemis and Apollon
Plynteria and Kallynteria(25 Thargelion)...Honoring Athena
Arrephoria(4 Munikhion)...Honoring Athena, Eros, and Aphrodite
Skirophoria(12 Skirophorion)...Honoring Demeter, Athena, Poseideon, Dionysos, and Helios
Dipolieia or Bouphonia(14 Skirophorion...Honoring Zeus.
A demos is a council.