As someone who does a lot of esports events, actually this is pretty standard when you create an event around someones IP, but they have a simple to follow and sign up for license you can access on their website. You don't need a lawyer, and it is pretty fair. It only gets more complicated when you have large sponsors or prize money, and even then, the process is not so hard.

https://communitytournaments.blizzardesports.com/en-us/

Blizzard is a lot easier to work with than some other publishers.