I did this towards the end of the year when it was time to review all the songs before the Primary Program. I asked 3 members from our ward to come in as guest judges. My husband downloaded the infamous American Idol intro music on a CD. I played that as our guest judges entered the Primary room and had a seat up front. Each Judge had a sign with their # on it. They also were each judging a different thing. For example: Judge #1 was judging whether the kids were watching the chorister & giving great effort. Judge #2 was judging whether the kids knew the words to the songs. Judge #3 was judging the volume & reverence level. They had these "thumb"s to either give a thumbs up or thumbs down for their category.
Was great! Kids really enjoyed it!