There are eight sabbats, or special days of the year on which Wiccan celebrations are held.
The most famous of course is Halloween, or Samhain to give it its proper name. Here is a basic list of all eight celebrations:
February 2nd is Imbolic
This is the day to celebrate the first glimpses of Spring, and it is also dedicated to the Celtic Goddess Brigid. Non-Pagans in the US celebrate it as Groundhog Day. Make new starts in life, as you give your home a thorough cleaning.
March 21st (or 22nd) is the Spring Equinox known as Ostara
Although a pagan holiday, this is one of the holidays early Christianity adopted as Easter. This sabbat represents the planting of seeds for new long term goals.
May 1st is Beltane
We celebrate it as MayDay and are lucky enough to have bank holiday, when traditionally local girls would dance around a maypole! Beltane is a celebration of fertility, growth, love and passion. However you celebrate Beltane, do it with joy and happiness.
June 21st (or thereabouts) is the Summer Soltices and is known as Litha
This is Midsummer, the longest day of the year and time to collect herbs and enjoy the light.
August 1st is Lammas
This holiday is also known as Lughnasadh and is the common harvest festival time, when traditionally harvest are drawn in, bread is baked and provisions stored for the winter.
September 21st (approx) is the Autumn Equinox and is known as Mabon
This signifies a time of equality between night and day. It is the second harvest festival and is the forebear of Thanksgiving. This is a time to consider what to be thankful for.
October 31st is Samhain, the most popular Wicca holiday, Halloween
Also known as All Hallowed Eve, this is the time when we celebrate our lost loved ones, and is felt to be a point in the year when the veil between this life and the next is at its thinnest.
December 21st is Yule, the Winter Soltice
Another of the pagan holidays adopted by early Christiantiy and turned into Christmas. Although non-pagans celebrate this holiday on the 25th, this day is celebrated as the longest night of the year, and marks an additional celebration in the run up to the holidays!