Feria De Abril
From Nookipedia, the Animal Crossing wiki
Feria De Abril is a real-life Spring event that happens between the 24th April to the 3rd May. It does not appear as an event in the game, but a PRO design from the event is given to the player by Wendell and a hat is given to the player by Pete from Nintendo, during the 9 days. These are available only in Animal Crossing: City Folk. These items are both the flamenco dress and flamenco hat
Flamenco DressWendell will appear outside their house on any day between the two dates. Wendell will claim he has designed a new design, which he wants players to have a look at. He will ask them if he wishes to see them with the typical Yes/OK and No answer input from them. Agreeing to see the design will prompt them to replace a currently stored design with the flamenco dress.
The flamenco hat is achieved after players receive the flamenco dress, by talking to Pete as they leave the house. He will be standing outside as per usual, waiting for them start the game and will give them a letter from Nintendo.
It's festival time in the
From the Spanish Staff
Players can achieve the flamenco hat by saving and starting the game after receiving the flamenco dress from Wendell. It may also be possible to enter the house and leave immediately to have Pete stand outside.