From ESPN:
Indiana officials knew the building, which first opened in 1971-72, needed work.
Last month, they announced Cindy Simon Skjodt was donating $40 million to help renovate the facility, which will be renamed the Simon Skjodt Assembly Hall. Among the planned changes are a new entryway, remodeled bathrooms and concession stands, and a big, new video scoreboard along with box seats above the south baseline bleachers.
But none of the proposed renovations involved the metal plates. Assembly Hall seats more than 17,000.
"They're confident in the integrity of the structure of the roof itself, but that's not to minimize it," Glass said, noting the roof had been inspected just a few months ago. "Obviously, there is a problem if the roof pinches down and pops a steel plate off. ... The engineers are confident that they'll be able to have that repaired and certify it as safe before the next men's basketball game."
Indiana Hoosiers' Assembly Hall found to have more loose plates in roof - ESPN