How to Trigger multiple spawners from one BP?

Hello All.

I am creating a game where the player will be moving between different rooms. Basically, when the player enters a trigger box, it will trigger all of the placed spawners in the room to spawn enemies. I have created an array inside the trigger BP that lets the user choose what spawners are in each room per instance. The issue is that, there is a “Spawn” event in each spawner, and what i want to do is trigger all of them in the array at once. I included an image below. I am wondering how I can accomplish this. Iv heard and tried Blueprint Interface, but I was a bit confused on how to actually use it.

Imgur

Imgur

Thank you!

if you already have a array or the spawner actors then its a simple matter of using a for each loop to call the event on each spawner actor in the array. as you can see in the pictures below is a pretty simple thing to accomplish. do note however that in this case i made the variable of the same type as spawner class which allows me to call the event without needing to cast. i also made the variable public so it could be set in the level viewer window via the details panel.

also you could probably simplify this system by just using target points to store the locations and do the spawning in the room bp. this would eliminate the need for spawner bps and have all the functionality in one location.

I actually got this weird error from spawning from the array. Any idea what would cause a red flag at all?
Imgur