Trigger events from different sources

Hey guys, I'm trying to make a crumbling platform, I have a parent CrumblingPlatform and children CrumblingPlatformPieces. The platform could respawn on different ways, so I decoupled them and use events OnTriggered, OnFinishedFalling and OnReady. I need to know which piece triggered the event, does anyone know a better way to do so than sending a reference on the event to 'this' everytime and for every event?.

 public event Action<CrumblingPlatformChild> OnFinishedFalling;
 public event Action<CrumblingPlatformChild, Collision2D> OnTriggered;
 public event Action<CrumblingPlatformChild> OnReady;
 
 private void TriggerReady ()
 {
     if (OnReady != null)
         OnReady (this);
 }

A possible solution would be to use lambdas in the calling side.

 private void SubscribeToEvent (EventTrigger trigger)
 {
      trigger.OnFinished += () => ConsumeEvent (trigger);
 }
 
 private void ConsumeEvent (EventTrigger trigger)
 {
       // My code
 }

Anyone can think of a better way?