This is the "Festival of the Vine," or the pagan Thanksgiving Day.
Date: ca. September 21, Autumnal Equinox.
Modern Equivalent: Thanksgiving.
Alignment: Solar, Female/passive; water.
Customs: Harvest Feast (usually held eve of full moon closest to Equinox), picking ripe produce (often turnips, or pumpkins/squash for Samhain), late corn harvest and stalk bundling, fishing, grape harvesting/new wine-pressing/making.
Symbols: Grape cluster/vine, corn bundles, a fish, cornucopia, gourds.
Sacred Foods: red wines, wild game (venison, bear, fish, pheasant, quail, etc.), squash, melons and all other vine-foods, fresh vegetable-breads and cakes, stews (old name: Pottage).
Threshold Time: Dusk.
Incense: Mugwort, myrrh, sage, Balm of Giliad, Iris.
Celtic God forms: Mabon (Harvest Lord), Bran and Branwen.