If u want to don't roll them just section them and plat and make sure it's neat and tight since they will be in over night ☺️
I always braid the night before, and put a good on. I also go to the barn early in the morning too so i can fix any braids! I do this so the morning of the show isn't so stressful
I would say no as the horse an rub them and damage their mane even with a hood.
Its definitely worth getting up that bit earlier to plait and make sure they look perfect.