Well two or three days ago, I received an email from CGA. They invited me to reserve a spot for the webinar (portmanteau of web and seminar xD) and then after I signed up for it, they gave me a url that's only for me. Representatives of the CGA (cadets and administrators) took questions from the audience and answered them, either through the chat box or they would speak into a mic. And there was a screen showing someone's computer screen and they navigated around the CGA website and showed us where we could find certain info.
I guess that since you have your son registered for the AIM app, the next webinar invite should get to you. The next webinar is on the 24th according to them.