On 26 March, IndyCar announced that it would postpone the two Indianapolis races to later in the season—moving the GMR Grand Prix to the Fourth of July as support for the NASCAR Cup Series' Brickyard 400 (and creating a rare NASCAR/IndyCar double-header with the Xfinity Series' Pennzoil 150),[64][65] and the 500 to 23 August—marking the first time in history that it has not been held in May. Therefore, the season was to tentatively begin with the Detroit Grand Prix. The Grand Prix of St. Petersburg was reinstated as the planned season finale, with a date to be determined.[66] On 6 April, IndyCar announced that the Detroit Grand Prix had been canceled.