Let's Celebrate! Another happy children's book By Sally Huss. We all like days to celebrate. But, why do we like them so much? Is it only the cake, the ice cream, or the presents? Or, is it a day to honor and celebrate something, a day to have fun, to be especially happy, and to share wishes like “Happy Birthday,” “Happy Easter,” “Happy Holidays,” “Happy St. Patrick’s Day?” If so, why not have a “Happy” day every day?