What if I want to attend all 4?

Not sure probably the same as your first time. I also plan on hitting all four.

The first one is "free" but currently there is no way to go to another event. It's been said that they are working on a pricing structure that will let people go to multiple locations.
I haven't heard when it will happen though.

Gunstock Mountain Resort New Hampshire was absolutely an incredible experience yesterday. My only off-road experience was limited to taking my '93 Explorer Sport on simple unpaved roads and snow covered side roads, never real off-roading. Our coach was superb with not only the experience but great people skills. I learned a lot on handling this beast of a unit and the various features. Highly recommend it to everyone. The Bronco performed remarkably over rocky, forested and very wet trails. Trail turn assist was not a novelty but a necessity for navigating a number of switchback turns. Utilized the front stabilizer disconnect and much of the trail needed the front and rear lockers. Terrific time with great instruction.