When organizing an event, it is common to include multiple smaller events within it. For instance, a college cultural event may comprise a range of activities such as dance and singing competitions, workshops, and shows. In this context, the cultural event is the mainevent while the individual competitions and shows are considered sub-events.

Typically, an event encompasses exactly one mainevent and one or more sub-events. The sub-events represent the specific activities in which participants or users actively engage during the event.