Ok then make a speech if you want it to be super special if you like the chick then write down the thighs you say in your head a say them to her. Explain how beautiful she is and how happy u would if she agreed to go to homecoming with you
God I hate those untraditional ways of asking people out. They are romantic, but it makes the other guys look bad and some of the things they show on YouTube are hard to out do. So me I'd just walk up and ask. I'm a straight forward guy.
Here's what you do. Make her a lunch, and have a napkin that says "Wanna go to homecomming with me? -[your name here]"