I try to remember to check the weather forecast before going. Not only for temperature and rain predictions but more importantly wind, speed and direction. That way when I get to the site I can set up my WSMs to be downwind of the EZ-Up. Sure does save gagging and choking on the smoke. If the wind speed is expected to be up then I may put up a wall or two. Then my WSMs get a bit of a wind shade.
One other tidbit. Before you go setting everything up, be sure to scope out the water/electric situation. Kinda sucks to get most everything in place only to find that the water is 50 feet further than you've got hose for. Same for electric. This way if there's a problem you can find the contest organizer and figure out some sort of answer that may include changing sites.
Lead Cook 'Second Star BBQ' using a Big Orange 'Prince', 22 OTG, SJS FBA & KCBS CBJ