Late Seahawks owner Paul Allen played a major role in designing the venue to maximize crowd noise on the field while maintaining an open-air structure.

Owner Jody Allen raised the 12 Flag to get Lumen Field rocking at the opening kickoff on Sunday against the Los Angeles Rams as the NFC West rivals squared off for a spot in Super Bowl LX. She was joined by former Seahawks Cliff Avril and Michael Bennett.

The ‘12th Man’ concept originated in 1984 when the Seahawks retired the No. 12 jersey to honor their fans. No player was allowed to wear the number, as it represented the fans’ crucial role in the games.

“Outside food in a clear plastic bag or pizza in a pizza box” is allowed at Lumen Field and Lumen Field Event Center, the venue said, although food must be single serving. You’re not allowed to bring in outside beverages such as soda, water, coffee and sports drinks.

Even though the Rams are in Seattle some 1,000 miles away from Los Angeles, thousands of the team’s fans still poured into SoFi Stadium on Sunday afternoon to root them on. Los Angeles officials held an NFC Championship game watch party at the Rams’ famed Inglewood,