The Silver Wedding Anniversary of Emperor Meiji and Empress Shōken

Source: Emperor of Japan: Meiji and His World, 1852-1912, Donald Keene, Columbia University Press, 2002, p. 471.
The wedding anniversaries of Japanese sovereigns had never before been a matter for public rejoicing, but when the emperor was informed that it was customary for royalty in foreign countries to celebrate “silver weddings,” he gladly gave his consent to the proposed celebrations.  To make sure the proper tone for the celebration was maintained, a committee was formed to investigate foreign examples. 

The Ceremonies
Source: Splendid Monarchy: Power and Pageantry in Modern Japan, T. Fujitani, University of California Press, 1998, p. 113-114.
The core ceremonies...began within the sacred and invisible confines of the Palace Sanctuary, continued into the public rooms of the palace where Japanese and foreign dignitaries observed them, and culminated with an imperial military review at the Aoyama Military Parade Field. 

Before noon, the emperor, dressed in his formal military uniform (seiso), and the empress, dressed in a white Western gown, received the felicitations of Japanese and foreign dignitaries.  These included over two hundred Japanese princes, peers, and high officials, both civil and military.

Also see the article Prints of the Emperor Meiji and Empress Shōken.