Nintendo announced on Twitter that an update will be available on the day of Animal Crossing New Horizons! It will allow the seasonal event "Easter Festival with Albin" to be deployed for all players.
It will be pre-downloadable from 02:00 a.m. on Thursday March 19 for all players who pre-ordered the game on the Switch eShop. Players who ordered the game in physics, will have to do this update at the same time as the installation of the game on the console. Please note, even if the update is downloadable in advance, you can only enjoy the event from March 20, the official release date of the game.