The fairies are bringing their traditional ceremony, the Green Leaf Carnival, to the Human World, meow.
If you ask Mika what kind of festival the Green Leaf Carnival is, she responds:
I'm not entirely sure of the history meow, but I think it's about saying thank you to the beautiful flowers that decorate our peaceful world, meow. It's an incredibly important evnet for those in touch with nature, like fairies, meow. If you see any walking around, ask them more about the carnival history, meow!