As stated in the video tutorial... the event NAME comes from JEvents throughout the full registration process. You need the JEvents content element for Joomfish. Get that and you'll get the final piece you need.
Ben, I know it works. Since the recent fix for this, no one besides you has reported an issue. The only thought I have is that you are using JoomFish 2.0.3. All of our development and testing of JoomFish was with 2.0.4. Not sure if there is a difference that could be causing this or not. I know of no other reason for there to be a problem though.