The 21st World Senior Chess Championships will be held in Opatija, Croatia, from November 14, 2011 (arrival of the participants) until November 27, 2011 (day of departure).

The Championship is organized by the Chess club “Rijeka” in agreement with Croatian Chess Federation, under the auspices of the Mountain-litoral County, the City of Rijeka and the City of Opatija....
http://www.chessdom.com/21st-world-senior-chess-championships