The stadium seems to be about 160 m from the closest part of JILA. Assuming that 100000 people arrive in a 2000 kg car each, the gravitational redshift would be

The stadium seems to be about 160 m from the closest part of JILA. Assuming that 100000 people arrive in a 2000 kg car each, the gravitational redshift would be around 1E-21. This is about 1000 smaller than the stability of the best JILA optical clocks.