Sanja Matsuri 三社祭
Sanja Matsuri (三社祭; literally "Three Shrine Festival"), or Sanja Festival, is one of the three largest Shinto festivals in Tokyo. It is considered one of the wildest and largest in Japan. The festival is held in honor of Hinokuma Hamanari, Hinokuma Takenari, and Hajino Nakatomo, the three men who established and founded the Sensō-ji Buddhist temple. Sanja Matsuri is held on the third weekend of every May at Asakusa Shrine.

| Location | Tokyo (東京都) |
|---|---|
| When | May (Spring — exact dates change every year) |
| Type | Japanese festival (matsuri) |
| Official website | https://www.asakusajinja.jp/sanjamatsuri/ |
Planning to go? The Sanja Matsuri is held in May, but the exact dates, times and any entry fees are set year by year. Check the official website for this year's schedule before you travel.
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Basic data from Wikidata (CC0). Description from Wikipedia (CC BY-SA), linked below. Details may change; the festival's official announcements are the authoritative source.