Where is a 3D game engine with an event based events system?
Unity is a 3D game engine with an (well, you have both unity events and c# events too) event based event system.
I have never seen an event system not based on events. Wouldn’t that be a non-event system??
If you have a specific question, here is how to report your problem productively in the Unity3D forums:
How to understand compiler and other errors and even fix them yourself:
https://discussions.unity.com/t/824586/8
If you post a code snippet, ALWAYS USE CODE TAGS:
How to use code tags: https://discussions.unity.com/t/481379