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In Joomla 5, the class "JEventDispatcher" has been deprecated and replaced with a new event system based on the Symfony Event Dispatcher component.

You can use the new event system by creating event listeners and dispatching events using the EventDispatcherInterface. Here is an example of how you can use the new event system in Joomla 5:

use Joomla\Event\Dispatcher\EventDispatcherInterface;
use Joomla\Event\Dispatcher\EventDispatcher;

// Create an instance of the event dispatcher
$dispatcher = new EventDispatcher();

// Add an event listener
$dispatcher->addListener('event.name', function ($event) {
    // Handle the event
    echo 'Event handler called';
});

// Dispatch an event
$event = $dispatcher->dispatch('event.name');

You can find more information about the new event system in the Joomla 5 documentation.