The Harvest Angels watches over the harvest.
But she does more. After everything is harvested, the Harvest Angels makes sure that seeds and kernels and bits of the crop are left behind...
...so that all the animals have enough food to hold them through the cold winter ahead.
Everyone needs a harvest angel. She can be found here and here.
Mabon is the Autumn Equinox. The Autumn Equinox divides the day and night equally, and we all take a moment to pay our respects to the impending dark. We also give thanks to the waning sunlight, as we store our harvest of this year's crops. The Druids call this celebration, Mea'n Fo'mhair, and honor the The Green Man, the God of the Forest, by offering libations to trees. Offerings of ciders, wines, herbs and fertilizer are appropriate at this time. Wiccans celebrate the aging Goddess as she passes from Mother to Crone, and her consort the God as he prepares for death and re-birth.