I haven't eaten at Junction (Essex Resort - they grow some of their produce and such, but they source locally for the rest), but I know they have a private dining room. I have eaten at Tavern, who also source locally, many times as it was convenient to my mom's Alzheimer's community. Tavern also has private dining in the Timber Room, but I don't know the capacity. The website for Junction says 10 people though. You could ask the Essex Resort if they can do a larger group.