The International Mathematical Union (IMU) has announced that the 40th General Conference of UNESCO has proclaimed that March 14 (pi day 3.14) will from now on be the International Day of Mathematics (IDM).
As March 14, 2020 is a Saturday, the international official launch will take place on Friday March 13, 2020. There will be two parallel international events: in Paris at the UNESCO Headquarters, and at the Einstein Forum in Nairobi, Kenya.
The theme for IDM 2020 is Mathematics is everywhere. More details here. Organisations at all levels are invited to announce their celebrations and there will shortly be a page containing material to help organisers
The IMU is deeply grateful to Christiane Rousseau for her initiative in proposing the IDM, and for leading the process all the way to the successful proclamation by UNESCO.