Jem Aswad Senior Music EditorIt goes without saying that a lot has happened since “Springsteen on Broadway” finished its first run on December 15, 2018. And although most theaters remained closed on this sultry summer Saturday evening two and a half years later, the Boss has seen fit to lead Broadway’s reopening, as if to give a cautiously optimistic signal to audiences — hey, if Bruce thinks it’s okay, it should be okay.