To sum up the results of training, use event reports: you can collect data for all training events, or get separate reports for each organizer.
With this report, you can see how many people really attended. If someone missed the event, you can assign them materials for further reading, or invite them to the next training.
This report shows the events hosted by the selected organizers and how many participants attended.
You can get even deeper and click on the number in the Attendees column to jump to the list of participants.