How to send a command to hundreds of blueprints ?

I’m trying this method as well and i’ve read the wiki about it, ( https://docs.unrealengine.com/latest/INT/Engine/Blueprints/UserGuide/EventDispatcher/index.html ) still, i can’t make much sense of it. What I did was creating an event dispatcher in a widget and connect it to a button:

and then in a separate blueprint I have created another event dispatcher with the same name and connected it this way:

I know it’s wrong but I can’t replicate what’s happening in the link you posted, could you explain a bit further/what am I doing wrong ? thanks !