Event planners have it tough. They put everything they can into making something go off smoothly, perfectly, without a hitch and along the way something always goes wrong or off the rails.
The secret is that they never let anyone know that something has gone wrong, they never show it on their face, they roll with it, they recover and they move on. There is a degree of experience worked in there as well as they look for cues to respond to in advance when they are about to happen.
We all need to channel our internal event planner on those days of the big events, especially when we have put so much into them. Because at the end of the day know one knows what your plan was, they only know what came out of it.