Did you have him before the fair or did you get him there? Did he just start showing these tendencies at the fair and not before with the mares? How do you know for sure he isn't proud cut? How long ago was he gelded? Did he breed before being gelded?
We have geldings that were cut early, cut late and proud cut but cut again. Most will drop out when there's a mare close that's in heat. Granted, I haven't seen them try to mount but they do groom the mare and sometimes act like a stallion. It's boys being boys. As long as he behaves while rode, I wouldn't worry to much about pasture antics.
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