You may discuss this page here.

To add an entry to the calendar edit the CalendarEntryPage and add an entry.

You may also add entries on any page. To do this add the page to the CategoryEventCalendar and use the format below for the event:

=== <event-title>  ===
 start:: yyyy-mm-dd hh:mm
 end::   yyyy-mm-dd hh:mm
 description:: <event-description>