Based on what's been confirmed and talked about so far, here's my educated guess:
March - St Petersburg*, Homestead
April - Long Beach*, Barber Motorsports Park, Phoenix
May - Indy GP*, 500*
June - Detroit x 2*, Texas, Road America*
July - Toronto, Iowa, Mid-Ohio
August - Milwaukee, Sonoma, Pocono
September - Boston*, Fontana
* - confirmed dates
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