I am wondering how to move one repeated event. We have a recurring event on every 2nd Thursday, but occasionally the event has to occur on the 3rd Thursday. How do I 'move' that one event?

Now I am creating a copy of the repeated event, setting it to 'no repeat' and un-publishing the repeated event for a short while. There has to be a better way, but so far have not discovered it. Any pointers appreciated.