 Complete the following phrase:  The provisional calendar was announced on 10 November 2009. In case a circuit was not able to hold a scheduled Grand Prix, a reserve race would take place on the same day at the MotorLand Aragón circuit. This was updated six days later, with a date change for the Czech round, moving one week forward. It was announced on 18 March 2010 that Aragón would be included on the calendar, at the expense of the Balatonring, due to the fact that construction work on the latter circuit could not be completed on time. On 19 April 2010, it was announced that the Japanese Grand Prix would be moved from 25 April to 3 October, due to the disruption to air travel after the 