I think it depends on the type of show. I would not at a "Participant" judged show but if it is a "Judged" show, I have always displayed them. I have seen that most judges look over them as they walk around. It is funny as they don't seem to want others to see how much time they are looking at them but I feel they are looking at the credibility of some of the past shows where you did well.

By the way, participant judged shows are usually a popularity contest and just end up pissing people off as their hard work is all up to the "buddy" system.