Shitaya Jinja (下谷神社) is a small Shinto shrine which enshrines god of fertility and fortune Inari.
It's a 2-minute walk from Tokyo Metro Ginza Line Inaricho Station, a 5-min walk from Toei Oedo Line Shin-Okachimachi Station, or a 6-min walk from JR Ueno Station.
It is said to have been founded in 730 in modern-day Ueno Park. After the shrine was move out of there in 1627, it was eventually relocated here in 1703. Its present complex was completed in 1937.
Its Reitaisai, or the Annual Grand Festival, is held on the weekend nearest to May 11th, and fully conducted only in even-numbered years.
Chozuya is where you purify your hands before offering a prayer.
Haiden is the building in front of which you offer prayers.
Honden is the very building where the deity of the shrine is enshrined.
Kaguraden is where tradtional music or dances are dedicated to the divinites during festivals.
In general, Shinto shrines hold one - sometimes two - Reitaisai, or the Ggrand Festival(s), annually.
Here at Shitaya Shrine, It's held in mid-May. For details about this event, see the article on the Reitaisai at Shitaya Shrine.