IOI 2019 took place in Azerbaijan, from August 4-11, 2019. More info is available on the official website.
Just finished IOI 2019 in Azerbaijan
USACO will organize several online contests in 2019. Participation is free, and open to all. The contests are available in four divisions: bronze, silver, gold, and platinum.
All returning participants start out in their former divisions, and new participants start out in the bronze division. The contests are for individuals only, not teams.
Each contest has 3 problems to which you will submit solution programs in C, C++, Pascal, Java, or Python.
The USACO 2019 December contest is available from December 13 through December 16. Visit the USACO website for more information: http://usaco.org/