It's doable, but have a very specific plan that you follow so you don't get behind. And definitely a box runner would be helpful, but if you don't have one you'll live. If you are on your own and the event will be a bit spread out you might let the organizer know you are on your own and see if there is a chance they'll make sure you get a spot setup a bit closer to the judging turn in.
Neil -- "Easy Bake Master"
NB Bandera [gone to heaven...conveniently located in Long Island, NY]
Rebel 23, WSM A, WSM B, UDS, Easy Bake Oven
Pork Pistols BBQ
MOINK...It's what's for linner.