The fields are nearly empty, because the crops have been plucked and stored for the coming winter. It is the time of the autumn equinox, Harvest Home, Mabon, the Feast of the Ingathering, Meán Fómhair or Alban Elfed (in Neo-Druidic traditions), is a ritual of thanksgiving. It is a time of plenty, of gratitude, and a recognition of the need to share our abundance with those less fortunate to secure the blessings of the Goddess and the God during the winter months. Day and night are of equal length, looking forward to the days’ shortening. The Autumn Equinox is the time of the descent of the Goddess into the Underworld. We also bid farewell to the Harvest Lord who was slain at Lammas. Welsh legend brings us the story of Mabon ap Modron, who dwells, a happy captive, in Modron’s magickal Otherworld — his mother’s womb. Only in this way can he be reborn.
In the northern hemisphere this equinox occurs anywhere from September 21 to 24. Among the sabbats, it is the second of the three pagan harvest festivals, preceded by Lammas/Lughnasadh and followed by Samhain. (via Wheel of the Year – Wikipedia).