Which Holiday did this beanbag come from?

according to subetalodge:- The Great Pandemic 2023: Obtained by defeating The Shadow 5 times in the Battle Coliseum

Subetalodge says it's from this latest Survival, "The Great Pandemic 2023: Obtained by defeating The Shadow 5 times in the Battle Coliseum" Here!

thank you ladies. It is muchly appreciated.