I know that here in Jackson County they just did the judging offsite of the annual Harvest Festival, and everything was copasetic with the OLCC. They were still able to have a beer garden with legal breweries, and homebrewers brewing (because wort isn't alcohol yet).
I'd keep my eyes out in The GP,Medford,Ashland area around August for this annual event, and also check out
Jackson County Fairgrounds - Harvest Fair Homepage
Grains Beans & Things
is also a good resource. The newsletter will give info about clubs and competitions for the local area.