Sometimes when performing at a fair the stage doesn’t really have a sound person. If they’re using professional variety acts, it’s normally not really necessary to have a sound guy there the all day, every day. On the stage I was on there were only two acts, me and a juggling act.
One of the things that I always do is take a picture of the soundboard:
The uppermost three cords are mine. Once the sound tech gets me where they want me, it’s easy to simply reference this picture whenever I show up and plug in. I don’t have to walk all over the fairgrounds to track down the sound guy to set my audio.