Blue Print communication and exposed variables troubles

I’m trying to get my character BP to cast to my Note BP and have and event run when the cast is successful.

I managed to get the cast working in my character BP and the display widget in my Note BP but I don’t know how to make the cast trigger and event in another BP.

I tried to expose the variable to set up a basic branch but the exposed variable only appears in my level BluePrint?

Is there an way to tell the Note BP that the cast is successful so as it will display the Widget?

Here is an image of the nodes for both BP’s so far the Note BP is triggered with a box collision and by pressing E