Square Enix has announced plans to broadcast all six stages of the celebration via video site Nico Nico, reports Andriasang.
The event will take place at the Shibuya event space between September 1 and 2, with the highlight being the unveiling of a new Final Fantasy XIII game on the first day.
Day two will play host to the Final Fantasy VII 15th Anniversary Stage, on which the voice cast from the series will make an appearance.
A simultaneous celebration will be held at the ACT Theatre in Seattle to coincide with the Japanese event.
Square Enix recently reissued Final Fantasy VII on PC through the company's online store.
> Digital Spy reviews Final Fantasy XIII-2
Watch the Final Fantasy XIII-2 trailer below: