Calendar data instances can be referenced in organization, workbasket, and Operator ID data instances, and service-level agreements. It records the work schedule of an organization or group of people, including holidays and shift start and stop times.
"The Calendar page displays multiple events, such as assignment goals and deadlines, in a typical calendar month format. At run time, the user can view the events and access a SmartInfo display for each. (The events may be work items, assignments, or other objects that have appropriate DateTime properties; they are not restricted to scheduled tasks.) Double-click any event to access detailed information about its associated case."
Hope this answers. If not, do mention about your business requirement.