The Cat in the Hat explains the origins of various holidays throughout the year, some well-known and some lesser-known, as well as some of the rituals associated with each. Annotation. With a little help from the Birthday Bird of Katroo, the Cat and Co. explain (in rhymed verse!) the origin of common holiday rituals such as lighting candles, dying eggs, and sending cards. Holidays include Christmas, Hanukkah, Kwanzaa, New Year's, Groundhog's Day, Valentine's Day, President's Day, St. Patrick's Day-and that's only through March! "The Cat in the Hat's Learning Library shows young readers that books can be entertaining and educational at the same time. This is a wonderful series!"