Unfortunately, some one IS going to get mad because her less than top grade project won't be accepted. So find someone everyone loves to accept or deny each item.
A 90 year old man or woman who is sharp and loves quality would be nice. At that age most of them don't much give a hoot what anyone thinks about their taste, and will tell that in plain words.
Or someone who has excellent taste and is moving in the next few months, right before the show is to be held.