Provide a hook to modify the actual ICS file before it is created

Overview

In some cases, clients want the ability to modify the Event ICS prior to it being sent out. This might be different elements of the Event dates, etc.

In my case, I have a client who needs to change the actual Event date depending on what was selected by the user during registration.

Solution

Develop a hook that will pre-modify the Event prior to creating the ICS.