Hello Dani and welcome to the forums. 🙂
Great question! To make the calendar itself private, you could add something like this to the default-template.php file:
<?php
if ( is_user_logged_in() ) {
// This is where the calendar code would go.
} else {
echo 'Sorry, this calendar is private. Please log in to see it.';
}
?>
If you haven’t modified one of our plugin’s template files before, then I would suggest checking out our Themer’s Guide to get acquainted with how to do it first.
Cheers!
Geoff