Kenkoku no Hi (建国の日)
Kenkoku no Hi, celebration parade.
The 11th of February is the National Foundation Day since 1966 in memory of the foundation of Japan in and as the day to grow love towards the country. According to the Japanese second old mythology, "Nihon Shoki", Japan was founded on this day in 660BC.
After the World War II, it had been prohibited to celebrate this day as GHQ was cautious about Japanese people getting too patriotic by worshipping the Emperor but with the desire of Japanese nation, it revived as Kenkoku no Hi in 1966.
Usually this day, there are celebration parades in many places in Japan but also, there are many protests against this celebration. It's quite controversial.
Protest march in Tokyo in 2010