Information for Luna Loves Library Day at Polka Theatre for Children, Outer London (Kids show). Join Luna and her Dad for an adventure among the library shelves in this exciting new musical for families. Luna looks forward to one special day... Library Day! It's the day when she discovers magic among the library shelves, from dinosaurs to mummies, from unexplained mysteries to monsters and magic. But for Luna, Library Day is also a chance to spend time with Dad, making it all the more special. Based on the critically acclaimed book by Waterstones Children's Laureate Joseph Coelho and illustrator Fiona Lumbers, join Luna and Dad as they discover magic and mystery, laughter and sadness and, through the power of stories, even start to mend their own history.