I have a great idea for this. Several years down the future when the three factions are nearing their goals, New Monarchy becomes a political super power, and since they are all about helping the people and the city, it makes sense that they would build an arena for the people to watch guardians compete in several sport events, including Sparrow Racing. I'm not sure what they other events will include, but it should all be similar to the old Roman Gladiator Arenas, with a cheering crowd and everything.