If I forward an email that I have received with your RSVP block in it, to another person, and they also click on the RSVP (yes I am attending) button... CC analytics won't register that an extra person RSVP'd because they weren't on the initial send.... So in situations where we know that our invite email will be forwarded to others so they can attend and RSVP, we will be using a link to an EventBrite page instead. This creates another step of work.. but it will log each person who RSVP's because it asks them for an email address etc. So I suggest that you look at Eventbrite and mirror their functionality in your software. You're almost there. :) Thank you.