Ironforge is full of empty locales, all of them too small and full of hunting trophies, guns and ham.
I don't know the requirements for a meeting location but here's a nice room in Kirthaven, Twilight Highlands, with 14 seats and a little extra space in the back by some barrels.
I hope you don't mind the Wildhammer decor. This is downstairs from the temple in Kirthaven.