What scale do you mean by "World Cup"?
Subsector-wide, sector-wide, Domain-wide, Imperium-wide? Whatever one decides on is limited by distance and time. IIRC, it takes 2 years to travel from one end of the imperium to the other. I might be wrong there. But regardless, double it so half the time is travelling and the other doing live media for "the game".
Do they use a farm system like baseball? Do they do years prelims like the FIFA World Cup?
I wonder what a gymnasium/training/media ship is like? Luxury staterooms, best possible med-bay. How much tonnage might a standard football or soccer field take? Don't forget for height for goalposts maybe more for the kicker.
What about ringers? You know, like if THE SPORT was water polo, having that Dolphin enforcer or a Luriani? Or if it involved 3D environment, having that Suerrat?
An Ursa football team:xh::
"Bear down, REGINA BEARS, make every play clear the way to victory;
Bear down, REGINA BEARS, put up a fight with a might so fearlessly.
We'll never forget the way you thrilled the Domain with your T-formation.
Bear down, REGINA BEARS, and let them know why you're wearing the crown.
You're the pride and joy of DENEB, REGINA BEARS, bear down.":coffeegulp: