Les Bois Park Outfit. HELP!!

So I've never been to Les Bois Park, in fact, I've never been to any horse races, EVER. So I have no idea what to wear??I'm going to Beef NIght at The Races tonight to celebrate a friend's birthday, but I have no idea what to wear. Should I wear a sundress? Jeans and a cute top? Well, it is hot, maybe shorts? I have no clue!!!

What do you think I should wear? Vote below