Maestro -3D group calendar visualizer aims at handling multiple schedules and highlighting common free times. One of the most powerful skills of Maestro is scalability according to the number of group members, which can be up to 18 users. The use of color and shape intends to create a more lucid picture of an organization's schedule, as opposed to traditional calendars which can overwhelm the user with information.The goal is not to produce yet another calendar application, but to define an interactive information visualization technique. This work concentrates on highlighting the relevant information, using primitive shapes and color differentiation to avoid a complicated depiction.