In this symfony tutorial i covered quickly how you could create your own events and how you could use them, this also includes how you can use the Symfony Event Dispatcher to dispatch an event, and also covered the use event subscribers along with the priority and all that good stuff.
This Symfony Events tutorial also went thorught how you could send an email to users using the SwiftMailer, also how to set the body of the email to be a twig view.

#symfony #event