Ryan,
I find it very difficult to believe that you are not fully aware as to what causes 'Fairy Rings' hence your post would appear to be a leading question. That you have them on your course is not unusual as I have yet to see a course in the UK without them. In effect, they are caused by a fungi causing an increased release of nutrients in the soil leading to a darker colouration of the grass. It can lead to the ground becoming water impervious in certain cases though these are rare and I do not believe you should be overly concerned about them.
Jon