It's Raining Rupees
This quest is unlocked after completing the Fairy Fountain: Battlefield challenge.
"The many adorers of the Great Fairies are planning to hold a festival where they fill the beloved beings' fountains with offerings to show their devotion. Naturally, they will need lots of rupees..."
"Moved by the sight of their fountains nearly overflowing with offerings, the Great Fairies became even stronger. They agreed that mortals really ought to throw festivals for them more often."
- Great Fairies: Enhanced Ability