How should I do my hair for my sister's graduation ?

My little sister is graduating pre school. I was wondering how I should do my hair for the occasion. It's casual but I don't wanna do just the basic straightening. I have medium length dark brown layered & angled hair. Keep in mind my hair is VERY difficult to curl. I just want something easy, cute, and casual. Also, afterward we are going to the city and it may be windy and cool out so something that will stay. THANKS !