If you are going to have a $300-$400 buffet, charging per head, you can consider to ask her staying at home.
If you just eat in the restuarant, you can order the dishes for sharing. Sometimes I think I can try more dishes and have more variety of the food because of having her.
In the food court,e.g. even at citysuper, you can only order noodles or even a set of meal just around $50.