Yasukuni Jinja (靖国神社) is one of the most prominent Shinto Shrine in Japan, adjoining the former Edo Castle in the north. It was a shrine presided over by the Imperial Army and Navy until the end of WWII and still preserves a shrine complex which survived the war up until now. For details about this shrine, see the article on Yasukuni Shrine.In early November, Shichigosan-no-gi (七五三の儀) is demonstrated at this shrine.

Shichigosan-no-gi at Yasukuni Shrine

In September, a custom called Shichigosan is widely practiced throughout Japan at Shinto shrines (and some large Buddhist temples). Shichigosan, literally meaning "seven, five, three", is a Shinto ritual to celebrate and thank gods for the well-being of boys aged 3 & 5 and girls aged 3 & 7 in November, especially on weekend days around 15th. Nowadays, children clad in kimono only visit Shinto shrines to attend brief rites with their parents, but in old days the ceremony was much lengthy.
There are many kids who come to Yasukuni Shrine to practice Shichigosan, but other than this, this shrine demonstrates Shichigosan-no-gi, the formal way of Shichigosan rarely practiced nowadays, on a weekend day in early November.