This book teaches students about the concept of a calendar. In the classrooms, you can ask children how many days are in a week and in a month. Calendar has to deal with time as well so you can ask students how long a day is and so on. This book shows these two girls who keep having to push the date back of when they can play together. As a teacher, you might want to ask children why is it important to have a calendar or know how to use one.