Gerald is careful. Piggie is not.<br/>Piggie cannot help smiling. Gerald can.<br/>Gerald worries so that Piggie does not have to.<br/>Gerald and Piggie are best friends.<br/><br/>In Happy Pig Day! Piggie celebrates her favorite day of the year! But will Gerald the Elephant be included in the festivities?<br/><br/>Using vocabulary that is perfect for beginning readers (and vetted by an early-learning specialist), Mo Willems has crafted a heartfelt story about celebrating the special occasions in life. Fans of the Geisel Award-winning duo will want to join the party!