Hi there --
When I test out the RSVP functionality, the RSVP buttons (No, Maybe, I'm Attending, etc.) take me to the Wordpress Login page (with the message: "Excellent, few more steps! We need you to login or register to get you marked as coming!"), not the registration page -- there's no link on the Login page to the registration page so if they don't have an account, they can't register.
I've been reading that there should be a registration popup form? If that's the case, it is not working --