OK, we have strayed off on athletes, but the statute does not say athletic event, it says professional SPORTING event.
SO, if I were the judge in a trial, I would refer to the definition of 'sport'. Websters says:
sport [spawrt, spohrt]
1. an athletic activity requiring skill or physical prowess and often of a competitive nature, as racing, baseball, tennis, golf, bowling, wrestling, boxing, hunting, fishing, etc.
2. a particular form of this, especially in the out of doors.
3. diversion; recreation; pleasant pastime.
4. jest; fun; mirth; pleasantry: What he said in sport was taken seriously.
5. mockery; ridicule; derision: They made sport of him.
So, if is a monster truck race as they call them, then racing is mentioned in the dictionary. That would apply to NASCAR, drag races, etc. Also, bowling is listed, whether you consider them athletes or not.
Now, to throw another twist into it, hunting and fishing is also mentioned. So, that means if you were a guest on a professional hunting show, or fishing in a BASS tournament, you would be illegal carrying (not withstanding COE lakes being off limits already)
Bottom line, it falls back to what I believe the original intent was, and that was football, baseball, basketball, etc. HOWEVER, this is such a gray area that you could get hung with the loophole of something defined as a sport that you would not think was. Personally, I think as mentioned previously, this one along with others need to be removed from chapter 46.