Scripting events have 3 properties:

1. The Moment and Condition in Which They Are Called (Event Name)
2. The Event System Used (Event Type)
   This determine how to register the event and access the parameters.
3. The Script to Execute
   This is your script or someone else script that you registered to a specific event to perform a specific behaviour on specific objects.

• Blueprints Events
  Those are the base game events, blueprints have a specific field for them and their parameter can be accessed with specific NWscript functions. They have not been changed so you will have to google for more documentation, here's a place to start: https://nwn.fandom.com/wiki/Event
• script_ran
• variable