Q:

How to Identify handling event in Lightning component

I have a lot of component in my Org. In one component Iam seeing the registered the event,How to come to know where is the handling Event?

A:

https://developer.salesforce.com/docs/atlas.en-us.lightning.meta/lightning/inspector_intro.htm
Use lightning chrome inspector and under events sub tab you can track all the handled and unnhandled events. 

