The 14th One Piece movie, which commemorates the anime's 20th anniversary, takes place during the Pirates Festival, an epic treasure hunt in which pirates from across the globe race to find an item that once belonged to Gol D. Roger himself!

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The world's greatest exposition of the pirates, by the pirates, for the pirates—the Pirates Festival. Luffy and the rest of the Straw Hat Crew receive an invitation from its host Buena Festa who is known as the Master of Festivities. They arrive to find a venue packed with glamorous pavilions and many pirates including the ones from the Worst Generation. The place is electric.
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(Source: AnimeNewsNetwork)