This guide contains SPOILERS in regards to what items ( and what is needed to purchase them ) can be found at the festivals.
----------
----------
The Seasonal Festivals happen on the 28th of each season ( check your in-game calendar! ). These festivals offer a special shop where you can purchase some goodies.
The special shop is located at the Town Hall. You must speak with the NPC that is hosting the event and there will be a new option available in their dialogue; Open Shop.
โข Spring ( Petal Bloom Festival ) = Mayor Merritt
โข Summer ( Hook and Line Festival ) = Eddy
โข Autumn ( Seed and Soil Festival ) = Holly
โข Winter ( Warm Hearth Festival ) = Frida
On the 23rd of each season, you'll receive mail from the host of the special festival shops to go see them. This leads to two quests which need to be completed. These quests do not repeat every year.
----------
----------
โจ Fae Festival โจ
This special festival occurs on Winter 14. On day 9 of Winter, you'll receive mail from Zido to go see them so you can begin the quest(s) to be completed. The special shop for this festival is also located at the Town Hall. To access the shop, speak with Zido at the Town Hall and a new option will be available; Open Shop.