The Event Registry is a table that stores the definitions of all the Events that can be triggered or processed by the ServiceNow system1. The Event Registry allows ServiceNow to react when Events are generated by executing actions such as sending notifications, running scripts, or starting workflows2. The Event Registry also provides information about the Event parameters, description, and source3.

References = 1: Event Registry - ServiceNow Docs 2: Event Management - ServiceNow Docs 3: Event Registry form - ServiceNow Docs