Answer:

The key is to approach this idea to a higher-up, preferably the school's council or the principal if you want to organize a sports event in school. Or you could go to your mayor if you want the sports event to happen in your community.

If your event gets approved, the mayor or the school council will help you with things needed for the event to go through smoothly. Don't forget to tell your community/school about it. The fastest way to spread the word about it is through social media.