Thousands of people prepare their floats, dances and performances for months. If the festival involves blocking off street — a complex series of approvals by city hall and the police are required.
Festivals aren't exactly easy to reschedule at the last minute. Besides, many festivals have occurred on the same day for thousands of years.
It's easy to understand why people aren't happy when it rains the day of a festival.
There are over 10,000 festivals in Japan each year. Many maintain a rain or shine policy. There are plenty of festivals that get caught in the rain — particularly summer festivals that coincide with the Japanese rainy season.
Most Japanese people always check the weather report and always have an umbrella for rainy days.
Its refreshing to see people having fun in the rain. Often rain seems to add to the energy of a festival.