Winter Solstice, the first seasonal holiday of the new year, Yule represents the defeat of the Holly King (Death) by the Oak King (Rebirth). The Sun is reborn on this day.
February Eve, banishes Winter and welcomes the Spring. First of the Spring 'seed' or fertility festivals, it begins the change from old to new.
Spring Equinox, a celebration of balance - not really Winter but not yet Spring. This is a fertility celebration.
Beltane - May Eve, last of the three Spring fertility festivities, a time for love and union.
Litha - Summer Solstice, longest day of the year, a celebration of life, the Sun King in all his glory.
Lughnasadh - August Eve, first of the harvest festivals celebrating the first of the early grains, fruits, and vegetables.
Mabon - Autumnal Equinox, time of the second harvest, associated with the fruits of the corn and the vine, preserving for the coming Winter season.
Samhain - November Eve, the last harvest festival, the Witches New Year, representing one full turn of the Seasonal wheel.