The third race of this year's World Championship will be staged in Rovinj, Croatia, on 30-31 May. The race in Rovinj will replace the one that should held in Sochi, Russia, which unfortunately can not be accepted due to financial and organizational problems.
The eight-stop 2015 Red Bull Air Race World Championship began in Abu Dhabi in February and is now preparing for the first ever stop in Chiba, Japan. After Rovinj, Croatia the remaining races will be held in Budapest, Hungary, (4-5 July), Ascot, United Kingdom (15-16 August), Spielberg, Austria (5-6 September), Fort Worth, Texas, USA (26-27 September), and the last one in Las Vegas, Nevada, USA (17-18 October).
Source: http://www.redbullairrace.com