U.S. Bank Stadium in Minneapolis will need to install curtains to black out the light that comes in through the transparent roof before it hosts the 2019 Final Four, according to Rochelle Olson and Joe Christensen of the Star Tribune.
According to the Star Tribune, the NCAA requires that the lighting during shootarounds and games must be the same for all four teams, so some sort of curtain or drapery must be installed to block outside light.
The roof of U.S. Bank Stadium is 60 percent transparent, according to the stadium's website, and there is more than 245,000 square feet of the clear ethylene-tetraflouroethylene material that makes up the roof, according to the Minnesota Sports Facilities Authority, which is the body charge of the stadium.