Official poster... I can tell you,it will be in middle of the field, they will mount a big awning, there will be some shops there, an enormous screen where they will put images of the roads and maybe they on live(not sure), a place where you can buy beer, surely some food also, and loooot of people, last year i remember people at parking making bbq waiting the fog go up hehehe...
Medina Del Campo is not really far from madrid, most of the travel by highway, if you are planning to go, i recommend you not go to the final, because you will see less dogs and less coursing, i think its better