 Complete the following phrase:  The 2015 Hungaroring GP2 and GP3 Series rounds were a pair of motor races that were held on 24 and 26 July 2015 at the Hungaroring in the Hungary as part of the GP2 Series and GP3 Series. It was the sixth round of the 2015 GP2 season and the fourth round of the 2015 GP3 season. The race weekend supported the 