What actually happens at a Japanese matsuri
The portable shrine comes down the street carried by forty people who are shouting in unison, sweating through their happi coats, and looking like they are either furious or ecstatic. It is not always easy to tell which. That is your first real encounter with a matsuri, and it is immediately obvious that this is not a performance staged for tourists. It is something else entirely.
Matsuri are Shinto festivals, tied to specific shrines and specific deities, and they happen throughout the year across Japan. There are thousands of them. Some draw enormous crowds in major cities. Others take place in neighborhoods so small that the entire event fits on one narrow road. The scale varies wildly but the underlying logic is the same: a community is fulfilling a religious obligation, and the celebration is the point.
The mikoshi is the heavy wooden portable shrine that people carry through the streets. It is believed to temporarily house the local deity during the festival, which is why participants treat it with such intensity. The rocking, bouncing motion is deliberate. The shouting is a kind of prayer. Watching it as a quiet observer is fine, but knowing what you are looking at changes the experience completely.
Food stalls line the approach roads to almost every matsuri. Yakitori, takoyaki, kakigori (shaved ice), corn on the cob grilled with soy butter, fried noodles, and dozens of regional variations depending on where you are. These stalls are run by real vendors, not festival decorations. Eating your way through them is entirely normal behavior, encouraged even. No one expects you to eat before you arrive.
Dress is worth thinking about. Many travelers show up in regular clothes and that is fine, but renting or buying a yukata (a lightweight cotton summer kimono) is genuinely welcomed rather than seen as appropriation. Shops near festival areas often rent them for a few hundred yen. Wearing one signals that you are making an effort, and Japanese people tend to respond warmly to that. The wooden sandals that come with rentals will make your feet sore after about twenty minutes, which is a universally shared experience regardless of nationality.
There is no formal schedule you follow as a visitor. You wander. You eat. You watch the mikoshi procession if timing works out, or you catch the taiko drumming at the shrine, or you stand and watch children play ring-toss games at stalls that are completely rigged against them in the most affectionate way possible. The absence of a structured agenda is part of the design. Matsuri reward slow attention over efficient sightseeing.
A few things to keep in mind. Mikoshi processions sometimes stop moving as participants argue, in a ritualized way, about which direction to carry the shrine next. This is normal. Do not step in front of a moving mikoshi or touch it. If a procession is coming down a narrow street and there is nowhere obvious to stand, press yourself to the side and let it pass. People will be moving fast and the whole thing is heavy and chaotic in the best possible sense.
Late evening is when festivals feel most themselves. The lanterns are lit, the crowd thins a little, and the energy shifts from exhilarating to something more gentle. If you can stay past the tourist rush and into the quieter final hour, you will see what the locals who actually live near the shrine experience every year. That version of the festival is harder to find on a travel itinerary, and far more worth your time.