Yule (Date: on the winter solstice): This is the Sabbat for celebrating rebirth. Many people celebrate it similarly to Christmas, with gift giving, feasting, and wreath making. People will often kiss a consenting partner under a sprig of mistletoe for good luck.
Imbolc (Date: February second): This Sabbat celebrates the return of spring. People make corn dollies and set them in a basket next to a symbol of masculinity. Many Witches will clean out their homes during Imbolc.
Ostara (Date: on the vernal equinox): This Sabbat celebrates the coming time of fertility. Egg decorating is common during this time.
Beltaine (Date: May first): This Sabbat focuses on fertility. Many Pagans choose to conceive children at this time (or just to enjoy themselves sexually with a partner--who consented and is of age, of course). Beltaine festivals are often high energy, with plenty of dancing and bonfires. This is the Fair Folk's festival.
Litha (Date: on the summer solstice): A Sabbat for celebrating the longest day of the year, as well as for mourning the shortening days after. Some Witches burn bonfires or light candles to represent the Sun.
Lughnasadh (Date: August first): This is the first of the three harvesting Sabbats. There are festivals of grain and bread. People make gingerbread men during this time.
Mabon (Date: on the autumnal equinox): This is the second of the three harvesting Sabbats. Witches give thanks to the Earth and the harvest. Celebraters will make and drink wine at this time.
Samhain (Date: November first): This is the last of the three harvesting Sabbats. It is also the festival of the dead. The veil is at its thinnest at this time. Witches will sometimes hold a dumb feast during Samhain.