Tracking attendance at group events

A feature that would be hugely useful for me would be a way of recording who attended particular events that are run for my group. A large proportion of my group would use the events that we provide as counting towards professional development requirements for their psychological registration. If I could record who attended certain groups, this would provide a great PD record for those members using my group for their professional development. It could also be linked to a "star" scheme where you can see which members are regular attenders at group events.