Link: http://espn.go.com/racing/indycar/story/_/id/9325703/indycar-dual-detroit-uncharted-territory
" Like the other doubleheader weekends on the 2013 IZOD IndyCar Series schedule, the Chevrolet Dual in Detroit was born somewhat out of necessity.
With former INDYCAR CEO Randy Bernard publicly promising 19 races for 2013 and facing a lack of interested venues, the series created three doubleheader weekends with full-length IndyCar Series races on both Saturday and Sunday. Toronto (July 13-14) and Houston (Oct. 5-6) are the other twin-bill weekends on the slate."
Here's the article:
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on June 1, 2013, 10:29 pm, in reply to "