Junior Roller Derby

Hi Wellington!
I'm thinking about starting a junior roller derby team, ages 10-15, for kids who already know how to roller skate and want to learn to play roller derby, or already know how and would like more experience/ people to play with. The Wellington area has some amazing grown-up derby teams (shoutout to Richter City Roller Derby, Remutaka Roller Derby, and Kāpiti Coast Derby Crew!) but my kid misses being able to play on a team and she's not old enough to join the grown folks yet.

Does anyone have recommendations on where would be a great places/ places to advertise to guage interest? Or suggestions on space--anywhere with a big flat floor?

Thanks!