Public Visibility for Events, Private RSVP

We are posting all of our events on our events page to provide visibility publicly. However, some of those events are for members only, so I want to put the RSVP link behind the member area firewall (and am looking for a tool/best practice for allowing them to RSVP). Are there suggestions for an easy way to do this that isn't a form (that doesn't work really well for us)?