Task: Question Generation
Input (English): A new Digimon series was announced 30 months after the end of Digimon Fusion at a 15th anniversary concert and theater event for the franchise in August 2014. The series announced the return of the protagonists from the original Digimon Adventure series, most of them now as high school students. A countdown clicking game was posted on the show's official website, offering news when specific clicks were met. On December 13, 2014 the series title and a key visual featuring character designs by Atsuya Uki were revealed with Keitaro Motonaga announced as director with a tentative premiere date of Spring, 2015. However, on May 6, 2015, it was announced that tri. would not be a television series, but rather a 6-part theatrical film series. The films are being streamed in episodic format outside Japan by Crunchyroll and Hulu from the same day they premiere on Japanese theaters.
Output (English): When was the 15th year anniversary held for Digimon?