In late August and/or early September, Subterranean Cat's bag becomes filled with Eternal Youth spring fairies. Eager to get rid of the pests, and curious about the humans' back to school "ritual", he trades the caterponies for the sweet treats young humans are typically given after a long day at school.

This event has so far run in 2014 and 2016. The first run of the event was when Eternal Youth spring fairies first made an appearance on the site.

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