The Sinquefield Cup begins tomorrow (via the USCF):

The 2013 Sinquefield Cup is a chess event of epic proportions. The world will be watching Saint Louis as four of the best players on the planet, including the top two in the world: GM Magnus Carlsen and GM Levon Aronian, and the top two in the U.S.: GM Hikaru Nakamura and GM Gata Kamsky, vie for the $70,000 top prize and the inaugural Sinquefield Cup trophy. Only one will be King.

From the Chess Club and Scholastic Center of St. Louis website:

Live coverage of each round of the event will be hosted through our partner site,www.uschesschamps.com, but this event will offer an unparalleled spectator experience, featuring multiple live Grandmaster commentary teams, access to the playing hall and more!