Create an assignment and choose 'Add Assignment to Gradebook'
As a student, submit to the assignment
As instructor, grade and release.
In the event logs, you will see the following event is thrown:
Next, create a new gb item
Create a second assignment and choose 'Associate with existing gb entry' and link the to the gb item that you just created.
As a student, submit
As instructor, grade and release
The gradebook.updateItemScore event is not thrown as it was with the previous case.