What is the fine-grained topic of the following text: If you needed to trigger an event at a certain place in your code in Magento 1, it would be fired by calling Mage::dispatchEvent(), while in Magento 2 there is a special event manager class – Magento\Framework\Event\Manager that fires events. Only return the topic.
Event triggering in Magento 1 and Magento 2