The Kheimonia is our celebration of the changing of seasons at the Winter Solstice. As it is a time marked mainly by the position of the sun in the sky, Helios, and therefore also Selene, are honored. At the Hellenic Temple of Apollon, Zeus, and Pan, we also honor the temple Patrons at this time.
Over the years, this festival has grown to encompass Demeter's Haloa and the Rural Dionysia as well, and so cakes and candies representing life-giving organs are made, and a very Dionysian ring-toss (ahem) has become a traditional game. In the interest of both including these elements and not excluding children of temple members, this has become a two-part festival, with the first half of the day being child-friendly and the latter half adult-oriented.
This is separate from the Pompaia, during which we ask for protection during the winter. Instead, this is a celebration of the change of season and the return of lengthening days.