I like to clean my horses before show day and organize the trailer also. It's so hectic on show days and we owe it to our horses to not be stressed when we are in a class. It saves time in the morning, too.
Most of the time i am leaving my house early to go to a show so packing the night before it always a plus. It helps to also have a checklist to make sure you have everything and look over it the night before and the morning of. Showing is soooo much fun and so being prepared keeps it fun. Great article