The Grand Festival is not a traditional square, but three festival performance halls are created in the wilderness map shown at the beginning of the story, and the 1st, 2nd, and 3rd idols perform in rotation (smog effects also appear when entering and exiting).
Characters from Splatoon are scattered throughout the map like Easter eggs.
It’s cute how they dance to the jellyfish song.
They don’t even just play the song, but for each performance, they use a remix of the movement and song that was actually used live.
It’s the last festival, so it feels like everything Splatoon has built up has been poured into it.
Seriously, it’s a festival worth playing just to play the game and watch the performance.