Shamrock Day

Shamrock Day is a holiday in that takes place on March 17, which is the same day as  in the real world.

During the day, Isabelle can be found in front of the Town Tree in the Event Plaza next to a specially-themed photo standee, but will instead relocate in front of the Town Hall if the event happens to coincide with the March Fishing Tourney (as it did in 2018). If the player talks to Isabelle, she will inform the player about the holiday and give them a Shamrock Hat.