Anyone still have this issue?
Simply comment out one line of code in wp-fullcalendar.php ??
Look for the function named ‘public static function ajax()’
comment out the line:
$args['post_status'] = 'publish'; //only show published status
In version 1.1 this is line 160 of file wp-fullcalendar.php
Not the perfect answer as it means amending the core plugin code, but if needs must….