In the episode The Great Story, the Grand Arena is seen hosting a tournament.
When Furty distrusted the Speedorz race, trouble brewed up and ShadoWind won the race. Afterwards, the Lions banned the big gatherings of tribes near their city and closed the Grand Arena. It is believed to have opened back up between Episode 15-16, though this is unconfirmed. The Arena officaly reopened in episode 27.