Golden Week (ゴールデンウィーク Gōruden Wīku) in Japan is a time of many national holidays. The holidays during this time are taken on 29th of April 29 and then May 3-5. The holiday on 5 May is Children’s Day (traditional known as Boy’s Day).
This photo was taken very recently outside Toyota Stadium, in Toyota, Aichi, Japan. The flags flown are called Koinobori (鯉幟) which means carp (fish) streamer. There are many different types, and they have been flown every year for hundreds of years in Japan.