This is about the Mascot Party held in 2012. This was a very small party and had no custom items but a custom town. This is noted to be the smallest party. You could meet Sensei , Rockhopper , Cadence , Penguin Band , and Aunt Arctic.
The only room decorated was the Town. Mascots would waddle around the island, adding penguins of CPYS. Mascots did have a limit on who they could add, so they could not add everyone.