People in Japan celebrates National Foundation Day by raising Japanese flags and reflecting the meaning of Japanese citizenship. It is observed as a national holiday in Japan, so most businesses and schools are closed during the day. People in Japan use the day to take a rest from the busy work day and gather with family. Overall, the celebration of National Foundation Day is rather quiet compare to the celebration of the other festivals in Japan. Looking to buy Japanese groceries to celebrate Foundation Day. Check out our on line grocery guide.