This year IOI will be held in Tehran, Iran between 28th July and 4th August.
Official website: http://ioi2017.org/
Facebook page: ioi2017.org
Check out the new version of this list with sorting and CF rating (updated by CF API):
Feel free to add (confirmed!) participants from your country here: https://goo.gl/forms/4BskHKHmZ70Tdck22 (preferred way) or below, in comments.