Which option is essential when creating a calendar event for a meeting?

Including an agenda is essential when creating a calendar event for a meeting because it clearly outlines the purpose and topics to be discussed, which helps attendees prepare effectively. An agenda makes the meeting more productive, as it sets expectations about what will occur and keeps the discussion focused. It also aids in time management, ensuring that all necessary topics are covered within the allocated time frame.

While the other options may have their own importance in different contexts, they are not universally essential for every meeting. For instance, adding a due date might not apply to all meeting types, and setting a recurring event is only necessary if the meeting is part of a series. Additionally, assigning a priority level is more relevant for tasks rather than meetings where the agenda plays a central role in guiding the discussion. Thus, while other factors can contribute to a well-organized meeting, the inclusion of an agenda is fundamental for clarity and direction.