A stadium is seen in SMG4: The Melancholy of Fishy Boopkins, located somewhere in Mushroom City, where Bob (under performing name Lil' Big Bob) was performing a concert, as part of his tour. It was a plan for Meggy, Tari and Saiko cheer up the then-depressed Fishy Boopkins, but failed.
The stadium is seen again in SMG4: Super Challenge 64, where it is now converted into an Australian rules/American football stadium. This is where one of Tari's challenges took place. Unfortunately, she failed in that challenge.
The stadium is seen to have a capacity of around 20,000 to 40,000 seats, and it's use is mostly for holding British football, Australian rules football, American football, athletics and music events. There is even a Jumbotron located at a side of the stadium. A roof covers the seating areas.