This is my favorite urban legend of all time, beating out both the man with the hook and the beehive full of spiders.

Just about every culture and religion has a spring celebration. At the link, a brief history of some of the most influential. Also, a new word for you: Ostara.

My favorite thing about this list is that it has something for every type of spring weather. If it's balmy, you can do these backyard crafts. If it's pouring, you can stay in and color.