how to do a event dispatcher from a widget to a actor blueprint?

Hey there, can someone please point me in the right direction on how to do a event dispatcher from a widget to a actor blueprint?
What i want is when a (widget)button is clicked, a mesh gets visible. when a other button gets clicked it disapears and another mesh gets visible.
The goal is to make a machine configurator with different brands of industrial robots and attachements.
i’ve searched for configurator tutorials, but they all just change the material and not the meshes?

264762-widgetblueprint.png