Another seasonal event in March in Animal Crossing New Horizons is Pi Day, π Day, or pie Day, which takes place on March 14. Pi Day is a celebration on March 14th as it is the date where ‘3/14’ lines up with the mathematical constant of Pi beginning with 3.14. So a special Pi Day Pie furniture item with the Pi symbol in the middle will be made available to order through Nook Shopping from March 1st to 14th.
When to get ACNH Pi Day items: March 1 to 14, 2021
How to get ACNH Pi Day items: purchase with ACNH bells in Nook Stop.