The good news is that it's easy and doesn't cost anything!
In order to register for the local Brackets For Good tournament you simply need to take the one-time step of filling out this form: https://bfg.org/nonprofits/registration prior to December 31, 2017.
Please Note: The process will first prompt you to create an account for you as an individual. Then, you'll create an account for your organization.
All said and done it should take no more than 5 minutes to complete, and Brackets For Good will confirm your eligibility soon afterwards.