…as an avid motorsport fan myself, I highly doubt this race is happening–not because of any business reasons, but because there has been zero work done on the track itself (as a DC resident I would absolutely know if they were scouting/building a road course on my regular running routes).
Road courses in Indy are usually built to (though not necessarily actually certified) FIA Grade 2 standards. While they aren't as demanding as Grade 1 standards that Formula 1 needs, it's still a massive task to design/lay out the track, improve the road surface itself, make any needed safety modifications to the roads, figure out what barriers/crash structures need to be where, and any one of a million other logistical details. It's simply not something I see being done in a half year; the Baku Street Circuit took two years, albeit being Grade 1.
And just to get a friendly jab in (all racing is good racing)…Indy's a solid third behind LMP1, per COTA lap times 
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