You would want to use a blueprintnativeevent then.
Here is rama’s wiki on the differences and uses of those two types
https://wiki.unrealengine.com/Blueprints,_Empower_Your_Entire_Team_With_BlueprintNativeEvents
https://wiki.unrealengine.com/Blueprints,_Empower_Your_Entire_Team_With_BlueprintImplementableEvent