Chances are pretty good that others are ticked off over the same thing. Voice it at the next meeting and see how others react. Also, a seafood meal for an event sounds silly as many people don't like seafood. A caterer should know this and be providing vegetarian options.

TBH, if this is the effort required of you, AND you have to pay full price... why not just go as a 'walk in' and have a stress free night?