According to New My Royals:
Emperor Naruhito proclaimed his younger brother as crown prince to the people of Japan and the world at the “Rikkoshi Senmei no gi” ceremony held at the Matsu no Ma stateroom of the Imperial Palace. The ceremony was attended by about 50 people, including Imperial Family members and government leaders.
Afterwards, at the “Houou-no-Ma” room, the Emperor gave Crown Prince Akishino the “Tsubokirigyoken” sword.
The ceremonies, together referred to as “Rikkoshi no rei,” followed the styles of the 1991 “Rittaishi no rei” rites in which the current emperor was proclaimed crown prince and celebrated his new status with guests.
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