This Unreal Engine 5.4 video is about building a Simple Event Manager.
We start by creating the Event Manager Blueprint, which is really just a container for current and future Event Dispatchers, intended to be more accessible across the project. Next, we Spawn the Event Manager in our Game Mode Blueprint’s BeginPlay, add a function to access it in the Utility Blueprint Function Library. We then update Enemy Base Blueprint to now call the Event Manager version instead, and update the Wave Manager to Bind to the Event Manager version as well.
https://dev.epicgames.com/community/learning/tutorials/1w3B/unreal-engine-34-simple-event-manager-let-s-make-a-tower-defense-game