Most Helpful Guy
I would go relaxed smart casual - You will probably be flung around on rides but you can still look smart. Jeans, boots and a nice top.0
Most Helpful Girl
I presume you are going to watch and are not taking part?
I would go smart casual. Dress for the weather conditions as you will be outdoors and I would personally avoid heels as you will be on your feet for a long time.
Hope you have a great date0