I was pondering this last night.
Say you already have 4 horses of yours entered in an event, and you go and buy another horse that's event trained and is also entered in that event from the previous owner/s entering them. Would you have to take one of the horses out of that event because then you'd have 5 in one event, or would it be okay since the horse was already entered when you bought it?
Just curious. ^^;