Hi Servando,
I did think of using the grades for this, but it only seems to give users a grade once they've been marked as attended. We're looking for a list of enroled users who have either attended a session, or have a session booked in the future, so we can encourage users who haven't booked/attended to book some of the remaining sessions.
The issue is that using a Seminar status report only gives us users who have booked at some point, meaning we have to work out who hasn't. It feels like it's impossible to filter for users who have not booked onto a session.