How does the event bus work in JEM

Joomla 3.9.26
JEM 2.3.0

Hi all,

we are relatively new to Joomla and PHP and try to modify some JEM features. One of them is related to the attendees view of my events (views/attendees/tmpl/responsive/default.php), where we want to change the function of the "attendee remove" button.

Currently, the button calls the task "task=attendees.attendeeremove", which we found in the controllers/attendees.php. We noticed that an event is dispatched there, but we could not find the corresponding observer for the event: $res = $dispatcher->trigger('onEventUserUnregistered', array($entry->event, $entry));

We had a look at the Joomla documentation on the JEventDispatcher, noticed that observers need to be registered, but we did not find where the observer in this case is registered in the JEM project. Could anybody please help us and point us to the correct code, so that we can change what happens on the event?

Thank you very much in advance!

Fabian

We found the corresponding function, it is in the mailer plugin.