Riichi Mahjong Central founded International Mahjong Day to increase the awareness of Mahjong and how to play. Japanese style Mahjong is growing in popularity in Japan. This platform especially lends itself to a social element. As a result, professional leagues, much like those in the United States, are growing, too.
In September of 2018, the Registrar at National Day Calendar proclaimed International Mahjong Day to be observed annually on August 1st.