The same tabbed dialog as when adding en event is presented to you when editing one.
However, one additional tab will be available, the “Comment” tab.
Adding Comments to an Event
Comments for an event are meant to post a quick update about the progress of the activities. These comments are also shown on the home page for users following the event.
Each comment is added to the event. Existing comments are shown at the bottom of the tab in ascending chronological order.