Nascar is saying it was definitely NOT there last spring. There are other "track events" and club "track days" held at most Nascartracks - but VERY FEW would have access to the "nascar garages". I've been to track day at Road America (Elkhart Lake) and the club guys bring their own "garages". I've been to CASCAR tracks up here in Canada and virtually everything is done in the infield pits (I've worked in the pits for a friend's vintage sportsman car) The open-center trailer served as a "pit" or "ramp" for repairs.
Generally speaking the "club racers" would not pay to rent the "nascar garages"