There are events announced in-game all the time but they don’t really seem to mention them on Nintendo’s Twitter accounts as much as they do for Fire Emblem Heroes.
☆ NintendObs Weekly – Monday, January 29, 2018 – Sunday, February 4, 2018.
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…Wanna play? Buy a 3DS.
That being said, click on Animal Crossing Pocket Camp for everything you need to know about the game. 😀