Программное оповещение подписчиков о событии

###Magento 1.x:

Mage::dispatchEvent($eventName, $data);

###Magento 2:

/**
 * @param string $eventName
 * @param array(string => mixed) $data
 * @return void
 */
function df_dispatch($eventName, array $data = []) {
	/** @var \Magento\Framework\ObjectManagerInterface $om */
	$om = \Magento\Framework\App\ObjectManager::getInstance();	
	/** @var \Magento\Framework\Event\ManagerInterface $manager */
	$manager = $om->get('Magento\Framework\Event\ManagerInterface');
	$manager->dispatch($eventName, $data);
}