“[H]undreds of artifacts [are] being prepared for the opening on Tuesday of the Rock and Roll Hall of Fame Annex NYC, a $9 million branch of the Hall of Fame and Museum in Cleveland. The Annex, in a 25,000-square-foot basement space at 76 Mercer Street in SoHo — upstairs, facing Broadway, is an Old Navy store — was created as a smaller, quicker offshoot of the headquarters.”