It looks like the Adventure Course will be a parallel raid to the rally course, and you should be able to get out and see the roadbook section of the rally with the rally bikes sharing some of the route. The course will need navigating but the terrain will be gravel tracks and easy going. The course will be doable on standard dual sport tyres.
There will be a camping area at the start and the whole event should have the feel of a rally bivouac.