Bon Dance Street
From the Super Mario Wiki
Bon Dance Street is a race track that appears in the game Mario Kart Arcade GP DX in the Don-chan Cup. It is a musical course specifically made for the new character Don-chan, from the Taiko no Tatsujin series.
The course takes place in a city late at night with a bunch of festivities going on, such as musical parties, fireworks, shopping, etc.