In this tutorial, you’ll learn how to utilize Custom Events and Event Dispatchers in Unreal Engine to manage and coordinate complex interactions within your project. Custom Events allow you to define and trigger specific actions, while Event Dispatchers facilitate communication between different Blueprints, enabling dynamic and responsive game logic.
https://dev.epicgames.com/community/learning/tutorials/MpG4/unreal-engine-in-development-event-dispatchers-and-custom-events