One thing I learned over time though, is that when I am present is that my presence is a distraction. It wasn't something I figured out - my son straight up told me. When I am there at a practice, he is constantly checking if I am watching, because he wants to make sure he is doing well (not because I am a crazy perfectionist parent - I hope... ) because he wants to show off. By not being fully engaged and present I give him the freedom to practice and make the mistakes that are necessary for bridging a basic skill to mastery.
I enjoy watching them learn, but not at the cost of my children being distracted from the task at hand. I will be present for every performance, and every game, but if I am going to a practice, I will generally drop the kids off and take a walk to give them space to mess up without being concerned what I am going to think or how I might respond.