The annual Chicago Auto Show opens Saturday at McCormick Place, and for the first time in nearly a century, one of the Big Three automakers will not be there. Tightening its belt in the wake of the protracted United Auto Workers strike last fall, Stellantis decided to skip the auto show entirely, pulling its Jeep, Chrysler, Dodge, Fiat and Ram vehicles off the floor and ending the two-decade run of the popular Camp Jeep test track. In the wake of the Stellantis exit, the auto show has consolidated exhibits down from two halls into one, but packed the space with an expansive lineup of brands, p…