Users can edit events on any accessible calendar in which you have write or manage permission.
You can edit events using any of the following methods:
Double-click the event that you want to edit. This can be done from any of the calendar views.
The event appears in edit mode in a new tab in the calendar pane. You can modify the attributes based on your requirement. Click Save on the calendar toolbar to save the event.
Use the drag-and-drop feature if you want to change the date or time of the scheduled event. From any of the calendar views, drag and drop the event from the original date or time to the new date or time. Attendees of the modified events are sent an update that includes the updated event.
Select the event and click the View Event Details link.
The event appears in edit mode in a new tab in the calendar pane. You can modify the attributes based on your requirement. Click Save on the calendar toolbar.