Elon Musk held his first solo event in support of Donald Trump for president on Thursday, encouraging voters in the Philadelphia suburbs to register to cast their ballots and vote early, though some attendees shouted back, Why? The America PAC event at Ridley High School's auditorium in Folsom featured the world's richest man speaking onstage in front of a large U.S. flag for roughly 15 minutes before taking questions from the crowd, many of whom wore Make America Great Again hats. The event was billed as a call to action to vote early in the crucial battleground state of Pennsylvania, where Trump and Democratic Vice President Kamala Harris are fiercely contesting the election. Some in the crowd questioned Musk's entreaties to vote early, reflecting the possibility that Republicans are still persuading their supporters to embrace early voting after Trump spent years demonizing the method. The crowd rose to its feet and took cellphone videos as Musk, the billionaire founder of Tesla