It has been really quite some time, but now a new release of the Mocca Calendar is finally finished that supports Nested Pages for Calendars and Events.
Aside of getting up to date with the not-so-new nested pages model of XWiki it also fixed some of the most annoying bugs, like problems when moving all day events or having to add a time when the event is all day anyway. Also it is now compatible with the FullCalendar macro in version 2.0.4 (the “agenda” view has been broken).
If you update to the new version, you might want to update the existing calendars and events with the Nested Pages Migrator Application – even if you never needed the Nested Pages Migrator because you started with an XWiki version of 7.2 of later. The extension page contains detailed information how to run the migration to get your current data into shape for the new version.
If you have any problems upgrading to the new version, please let me know so I can give advice and update the documentation.