A school calendar is very similar to any other calendar used to keep track of important dates and events. Schools often issue their students and parents school calendars that include the events or details of each school day in the year.
School calendars are useful to keep students and parents informed of the school's schedule and special events. For example, a school calendar may mention that students have a holiday on a particular Monday or that there is school-wide assembly on a certain Thursday. It is important to keep track of the events on the school calendar so students don't arrive to school unprepared.