This is the main section for the Summit and they'll start posting up info before too long on registration, trails, etc. There is also a Summit website that has the info and is where you go to register, or try too, when it starts. The Moab trips are just set up by individuals both before and after Summit and aren't really a part of the Summit themselves.
This is the forum Summit section.
National Summit Discussion - Toyota FJ Cruiser Forum
This is the Summit website.