Have we not had that discussion already? If you change configuration during an event, ask the jury for permission and get a notice on the noticeboard. That is the way crew changes are usually done, and I think that is fair enough. Jury should not allow it unless there is some kind of injury, urgent matters at home or work or planned (and noticed the jury about) a long time before the event (say a week). In my opinion it dont have to be more complicated than that. Switching configuration from day to day to match the weather is not something I would like. We can put provisions like this into our event rules.