Sabbats with their often used meanings, very shortly put
The descriptions centers on the commonly stated natural cycle, with mythical cycles of the deities left out.
Feb 1st/2nd. Imbolc / imbolg / oimelc/ candlemas / Brigit's Day
The spring arrives; the winter starts to give way to the next season. It is time for celebrating light and fire. It is the time for cleansing, both for the home and in a more personal level. It's the time for changes, the quiet life of the winter changes to the busy part of the year. Lambing season, the date to celebrate the budding life emerging in spring.
March 20th/21st Ostara / eostra / Lady Day / Spring Equinox
Light conquers darkness. The first real day of spring, when the masculine and feminine forces of nature are in balance. The date when the seasons have properly changed - the trees are having their leaves, birds sign and build their nests, it's time for the first planting and sowing of seeds, the date for beginning the work in the gardens.
April 30th / May 1st Beltane / Walburgisnacht/ May Day
The celebration of fertility, birth and blooming of all life. It is summer, trees are in full leaves and flowers, birds are tending their eggs and some even their young. The cattle are moved to their crazing grounds through the smokes of the may bonfires.
June 21st / 22nd. Summer Solstice / Midsummer
The longest day of the year. Midsummer - the summer is at its fullets. Crops are growing, flowers are blooming and the animals have their young to tend to. It is the time for great magicks and bonfires now that the night is at its shortest.
August 1st/2nd. Lammas / Lughnasadh
The time of the first harvest. Death steps into the picture in the form of "death of the corn", the cutting of the crops. The first bread are baked from the first harvest.
September 20th/21st. Mabon / Autumn Equinox
The second harvest, the beginning of autumn and the ending of summer. The time for collecting fruits. Another day of balance between light and dark.
October 31st / November 1st. Samhain
The end of summer. The year is changing - the last harvest has been collected and the farm animals move from summer's crazing grounds to their winter confinements. It's time to celebrate and commemorate the dead..
December 20th/21st. Yule / Winter Solstice
The shortest day of the year, after which the light starts to return.
All this information was taken from http://www.kaaos.org/faerie/sabbats.html I haven't got to fully check out the site yet but I wanted to Quote my sources!