I have been to camps and showcases/tournaments in the fall where they are training college umpires. It was a little distracting to some of the players but I think that also speaks to their level of play. The really good players did not seem affected at all. I did have a parent near me who complained loudly and I just turned to him and said the coaches couldn't care what the umpires are doing. It is about the players. He was also the guy who complained about balls and strikes by the umpires when his kid was batting. I'm sure he helped his kid with the college guys (not). I reminded him twice that it was a showcase and not a real game. His answer was when my kid steps on a field it is all real no matter what is going on. I said then let him play the game and stop being that dad and walked away. A few minutes later the coordinator of the showcase came over and asked him to stop yelling or leave. He stomped off.