Nook Shopping seasonal event

Nook Shopping seasonal events are minor events in that offer one or more unique items to purchase via Nook Shopping. Unlike standard events, seasonal events are not celebrated in-game aside from the items and are not unlocked until the day of the event; this is done by checking via the internet to verify if the date is accurate, meaning they cannot be accessed prior to the event date by manipulating the Nintendo Switch system clock. Each seasonal event lasts around a month and features one to four unique items, a description of that event or the items in the real-world, and the countries or regions it is celebrated in.

Note that all items are available in all regions at the same time, with the exception of the Summer and Winter Solstices, which have different dates in the Northern and Southern Hemispheres beginning in version 1.6.0.