Wicca is an ancient religion, origonating from the Irish and the Shamans. It is a religion that believes with heart in a Goddess and a God. Many wiccans only celebrate to the Goddess, but do know of the existance of a God. Wiccans worship the earth, and try our hardest to improve the nature around us.
Here are discriptions of some of our celebrations...the Sabats:
Samhain
Beltane
Laghnasadh