Grass won't be growing all that well rolled out in November in December. no, but summer/spring/fall months it would grow well and still allow the Bears to use the stadium for other purposes, march madness, concerts, what have you, and not destroy the turf doing so. Plus, a grow-house could be constructed next to the stadium if you want to keep it warm but dormant during the winter all grow house technology should be used for something more important, and icky.