Events+ user registration link to Gravity forms

I am using
Wordpress 3.8.1
Events+ 1.7.1
GravityForms 1.8

Scenario: New user arrives to this page

They click on Attending

Currently on click, the user is redirected here:

My goal is to use a Gravity forms user registration (front end) form


I did a search earlier and found this answer for membership

I just can't figure out the details for Events+

Looking forward to the answer!