Kasparov comes back after 12 year retirement. He will be competing in the Rapid & Blitz competition being held in St. Louis August 14. -19., which is the part of the Grand Chess Tour.
http://grandchesstour.org/news-press-release-2017-sinquefield-cup/historic-sinquefield-cup-brings-top-world-chess-talent-saint
Garry Kasparov became the youngest world chess Champion in 1985 at the age of 22. He ruled as the world chapion FIDE till 1993. He continued as a world champion of Professional Chess Asociation till 2000. After retirement in 2005 he became a politician critisizing Putin's regime in Russia.
I recommend you to listen the speech "The happist Day of Your Lives" to St. Louis University graduates in May 2015.