(1) I would present to a school board or a group of parents in a power slide. Talking about how bullying affects people in a way that it can lead to depression. Providing the cons when it comes to bullying. Persuading adults to help stop bullying
(2) to a group of middle schooler, i would let them voice their opinions on bullying itself. You can also make a poster where each student writes their thought of bullying
You can also use the opinions and thoughts middle schooler have into present your ways to stop bullying.
hope this help ;)