Thank you for your reply, Neil.
I can see the seminar sessions now in my report. I'd like to get it so learners can see it in their Past Bookings (based on the Seminar Session report). Currently they can't see the completions when the course is set to 'Not Visible'. As soon as I change the status of the course, the seminar sessions are listed.
If you can get it so it shows seminar completions to non-admin, then the problem could be with our setup?