The Silverdome refers to the stadium that opened in what year?
Pontiac Silverdome The Pontiac Silverdome, formerly known as the Silverdome, is a stadium in Pontiac, Michigan, United States, which is a suburb of Detroit. It opened in 1975 and sits on 127 acre of land. When the stadium opened, it featured a fiberglass fabric roof held up by air pressure, the first use of the technique in a major athletic facility. The roof has since been destroyed. With a seating capacity of 82,000, it was the largest stadium in the National Football League (NFL) until FedExField (91,000 capacity) in suburban Washington, D.C., opened in 1997.
Ryan Field (stadium) Ryan Field is a stadium in Evanston, Illinois, United States on the campus of Northwestern University. It is primarily used for American football, and is the home field of the Northwestern Wildcats football team. The field opened in 1926 and holds 47,130 people. Prior to 1997, the stadium was named Dyche Stadium, for William Dyche, Class of 1882, former Evanston mayor and overseer of the building project. In 1997, the facility was renamed Ryan Field in honor of the family of Aon Corporation founder Patrick G. Ryan, who was then the chairman of Northwestern's board of trustees. The renaming was made by the other members of the board in recognition of the Ryan family's leadership and numerous contributions to Northwestern, including the lead gift to the Campaign for Athletic Excellence, Northwestern's fundraising drive for athletic facilities.