Hello
For reseting the attendees response status, we modified 
kronolith/lib/Driver.php, function readForm ()

            if ( Util::getFormData ('saveAsNew') ) {
                 foreach ($_SESSION['kronolith']['attendees'] as $key => $val)
                 {
                     
$_SESSION['kronolith']['attendees'][$key]['response'] = 
KRONOLITH_RESPONSE_NONE;
                 }
             }

It doesn't make that much sense to me. The attendees would get a 
notification about exactly the same event that they already replied 
to, if we notify them on copying. At least if the user editing the 
event doesn't change anything at the same time. The only thing that 
would make sense to me is to reset the attendee status, and use the 
notification checkbox like with any other event editing.

That makes sense to me.

Hello

The button saveAsNew provides a full copy of the event. The attendees 
list and acceptance status are copied to the new event. Instead of 
copying the acceptance status, should we not send invitation mail to 
the attendees ?

Regards

Patrick