Personally, I think the Carver club is worth the risk. Space and light make a nicer experience for all involved. The Mitchell club seems small. The Armory in Buzzards Bay might be another option (my kids' teams/club used to rent it for soccer practice), not sure of details or cost (I think you have to pay a janitor to be there).
The only problem with the risk is that some people have a long drive, and it would suck to come up and have it canceled because it was muddy.
I agree with those that said to have it upstairs in Carver. Last year was my first one and had a blast. Met a lot of great people and learned a lot of things.