Office 365 (Outlook 2016) - Create or Edit an Appointment
The following Microsoft article will provide details on creating or editing an appointment on Outlook 2016.Appointments are activities that you schedule in your calendar that do not involve inviting other people or reserving resources. You can turn an appointment into a meeting by adding attendees.
Click the following link to visit Microsoft's guide on creating or editing an appointment:
Create or Schedule an Appointment