You don't, on two levels.
Workflows are not "added to events". An event is something that is generated by an action in JIRA. Moving an issue through a workflow is one thing that fires events. You can fire custom events in workflows. It's not adding workflows to events, that's nonsense, but you could say "use custom events in workflows". To do so, edit the workflow you are interested in and look at the post-functions - one will say "fire event X", which you can change to your custom events.
On the second level though - don't edit simplified workflows. It's not supported and your users can stomp all over your changes.
I have multiple projects that use variations of the same base workflow. The variations depend on the requirements of the project or issue type. The variations mostly come in the form of new statuses ...
Connect with like-minded Atlassian users at free events near you!Find a group
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no AUG chapters near you at the moment.Start an AUG
You're one step closer to meeting fellow Atlassian users at your local meet up. Learn more about AUGs