A watcher is a user who has chosen to watch the issue.
An attendee, is, well, probably a user who you name in a custom field called attendee. But we don't know what you've configured to make it available. (JIRA's built-in user fields are Reporter, Watchers and Assignee, I don't know where your attendee has come from)
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 ...
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