Enter an event and, if you do well on a hole, quit and save the game when you would normally hit the ball off the tee for the next hole. Re-enter it by going back into any mode. If you do not do this, it will be deleted. Keep doing this until you finish the course. If you do not do so well on a hole, quit, but do not save. Load your profile and enter again. You will be at the final hole you saved at. Continue as usual and save as often as needed. It is very possible to get a score of -20 while doing this.