Moving in and out of the sun while photographing events

Light does not change it's behavior with film or digital. Light is light. You just need to learn how to see it and modify it to your needs for your event. We have been gifted with one real light...the sun...our job as good photographers is to emulate that light and make proper images using the tools at hand to do that.

You might want to try shooting in shutter priority, as this will shift your aperture to compensate for the changes in light as well as capture movements. If you have a stationary subject and the sun changes due to a cloud, then I would suggest using aperture priority. Shooting in the shade during the event is yet another suggestion. I shoot youngsters as well as special needs children and I made up a large sheet of cartoon characters that fit around my lens. This way they are looking directly into the lens. I can hide behind the sheet of cardboard so its less intimidating. I also am positioned away from the camera by use of a WIFI device connected to the output of my camera that can be viewed on my iPAD.

I also make it a point to sit with the special needs and very young children before the shoot so the can be familiar with me. Cameras and photographers can scare the little ones.

I don't think there was anything stationary about the child subject he was taking. It was stated in his original post a week or so ago, and evident in this post that he would have to keep up with a mobile child. so switching to aperture priority from shutter priority for a moving cloud may be insufficient. He is point the camera in and out of shade and sun. Also, a stationary camera with a remote is also not an option for this type of event photography.