title: Symfony - Can't to find Event's Listener
body: <p>I have a problem with Events in Symfony. I do not understand how way it works. This is my Listener:</p>
  
  <pre><code>class ClientVisitedListener implements EventSubscriberInterface
  {
  
  public static function getSubscribedEvents()
  {
      return
      [
          KernelEvents::REQUEST  =&gt; 'sprawdz',
      ];
  }
  </code></pre>
  
  <p>My service.yml</p>
  
  <pre><code>anderos_invoice.invoice_club_listener:
  class: Anderos\AcpPriceBundle\EventListener\InvoiceClubListener
  arguments: [@service_container]
  tags:
      - { name: kernel.event_subscriber } 
  </code></pre>
  
  <p>In all system, I have not any dispatcher. How does it work?
  Where is the start of this procedure? Maybe in Kernel?
  Could you help me to understand that procedure?</p>