When using Heja, you might have noticed this 
icon beside players in the schedule.
When a team member has this icon beside their name, it indicates that they have not yet seen the event. If an event has been updated, then it will also be used to indicate that they have not seen the update.
Good to know:
If a parent RSVPs for their child, and the child has an active account, then the not seen icon will remain, as the child themselves has not seen it yet. This is the same when a coach or admin changes someones RSVP status for them.
When a parent RSVPs for a child that they manage; and the child doesn't have an active account; the not seen icon will disappear.