One Piece Day is celebrated on July 22 as the anniversary of One Piece. It was established as an official anniversary by the Japan Anniversary Association in 2017.[1]
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The One Piece manga officially began serialization in Weekly Shonen Jump on July 22, 1997. As part of the 20th anniversary celebrations in 2017, the day was established as the annual "One Piece Day".[1]
To celebrate the anniversary, a livestream is held on July 22nd and 23rd of every year, during which various projects are announced.
In 2024, One Piece Day will be held on the weekend of August 10th,[2] and will be immediately followed with an event titled One Piece Emotion to celebrate the anime's 25th anniversary.[3]