Waiting for former president Donald Trump to take the stage Wednesday at Bojangles Coliseum in Charlotte, one desperate event organizer was seen instructing attendees on how to turn their signs right-side up. In the prelude to the former president’s first big public event outside the Republican National Convention since the assassination attempt in Pennsylvania, Trump’s MAGA supporters could be seen on livestream holding up “Trump-Vance” signs and dancing gleefully to 1980s power ballad “Gloria” by Laura Branigan. There was just one problem. Many held their signs upside-down. Want more breakin…