At this gallery celebration, tykes score a sneak peek of Everything Butt Art at the ZOO, a new activity book and iPad app that teaches kids to doodle animals by starting with the derriere. Little ones will actually be encouraged (for once!) to channel their potty humor in reading and drawing activities with author Brian Snyder and illustrator Alexis Moniello. Balloon animals, snacks and book signings round out the festivities. Ages 3 and up.