vipulul,
It sounds like you are trying to allow your Actors, Character and HUD to communicate with each other. If that’s the case you can benefit from watching my tutorial video here Unreal Engine 4 Blueprints - Create a scrolling journal/log HUD widget. - YouTube which explains who to allow those 3 components to communicate to each other (on Actor Begin/End Overlap).
Check out my video and let me know if that helped you at all. If not I’m more than happy to find another solution that works for you, given some good practical examples of what you are trying to achieve.