In the Partner Centre, click on your event, then Participation. This tab provides information about whether people are watching the videos on their apps or website. Once they have watched a video, the dot will be coloured in and a larger circle will appear on the session they have just watched.
If people are attending an On Location event and have watched the weekly video together, this will not be automatically ticked off on the platform. You will need to do this for them at/after the weekly session, as they will not be able to access their challenges without it. From the Participation tab, tick the empty circle for all participants who attended that week and then click Save Attendance. This will now be registered both in the Partner Centre and on their app.