Ostara, the Spring Equinox, celebrates the return of spring, life, light and the Goddess Eostre.
Eostre is an Anglo Saxon goddess. She exemplifies youth, joy, light, dawn, new beginnings. Her energy is that of innocence.
When there were only two seasons, summer and winter, the winters were long. Eostre brought the summer back each year and her return was a great celebration.
Decorate your altar for Eostre with pastel colors, spring buds, butterflies, Easter eggs (which belong to her) and other symbols of spring. Her companion, messenger and symbol of fertility is the hare. If you are not familiar with Eostre, you might want to send a message with the Hare to invite her to attend your ritual. Offer the Hare a place at your altar also.
Celebrations held outside are especially appropriate for the Equinox. If you would like to find out more about Eostre I highly recommend Goddess Alive by Michele Skye. The first of her books celebrating the Goddesses, there is a chapter dedicated to Eostre as well as a wonderful ritual that would work well alone, with a circle or especially with children. (I am not going to reproduce it here as it is 7 pages long)