I would say in the 1980’s or early 1990’s on Thanksgiving Day almost everything shut down in Chicagoland. But in the last five years most supermarkets like Jewel Osco, Mariano’s and Whole Food had stayed open on Thanksgiving Day. There is a Whole Food at 51st and Lake Park and the new Jewel Osco at 60th and Cottage Grove. You can certainly get food from either locations for the dorm Thanksgiving Dinner. I wonder whether Jewel will still do the $5 sushi special on Thanksgiving Day 
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Once you get over Thanksgiving Day, all the eateries in Chicagoland will be open from Black Friday through Sunday. Then the question is whether your kid wants to go the Loop and fight the crowd on Black Friday.