well, if you're taking the clinic, they usually have stalls available for those participating in the clinic at wherever it is. I think unless you have a good way to get there and back, it's probably not going to happen. I wouldn't want to trust a hauling company with my horse for something like that. I know the clinics I've gone to, often the people riding in them either have living quarters on their trailer or a camper on their truck when they don't want to stray too far from the horses, or pay for a hotel.
Ask Often, Demand Nothing, and Reward Generously.