Invention Day in Japan

Inventors' Day in United States on February 11;

World Technology Day for the Future on May 13;

Inventors' Day in Hungary on June 13;

Inventors' Day in Argentina on September 29;

Inventors' Day in Germany, Austria and Switzerland on November 9;

Inventor's Day on February 2 (Thailand);

Children's Day in Japan on April 17;

Restoration of Sovereignty Day in Japan on April 28 (主権回復の日 Shuken kaifuku no hi - It marks the end of the American occupation of Japan on 28 April 1952)