Crews worked diligently Tuesday on a stage that will kick off the NFL season before the Seahawks take on the Packers in two days.
SoundGarden and Pharrell Williams will perform.
The concert is free for everyone.
Gates open at 2:30 p.m. Police are asking people not to camp out in line overnight, but they do not plan to enforce the city ordinance against it.
The set up, right next to CenturyLink, will allow fans to enjoy the concert on a big screen from their seats inside the stadium. It's a first in NFL season opener history.