Call Blueprint Widget Event in C++

Development Programming & Scripting Blueprint
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Hello, I have a widget blueprint that has an element that I want to display when something happens. (Part of the widget, since the whole widget is already displayed in-game, I just want to display another part of it on event)

So I have made the event in the Blueprint Widget, I want to call that from the C++ gamestate class when something happens.

C++ Widget

	UFUNCTION(BlueprintImplementableEvent)
	void ShowGamePhaseMessage();

C++ GameState Header

	UPROPERTY(EditAnywhere, BlueprintReadWrite)
	TSubclassOf<UUW_Timer> TimerClass;
	UUW_Timer* TimerWidget;

C++ GameState CPP

//in construct
TimerWidget = CreateDefaultSubobject<UUW_Timer>("TimerWidget");

//in the function I call it like this
TimerWidget->ShowGamePhaseMessage();

Now the Blueprint part of the widget doesnt matter since it doesnt do anything, not even when I print a string.

What could be the problem? It looks like that the gamestate never calls the event or the class is null or something so it cant call it.