By Riley Gutiérrez McDermid It was an unprecedented show of tech wizardry and glamour. The founder of tech giant Tesla put on an unprecedented opening to his latest factory opening this week, wowing the crowd with a coordinated show of drones lighting up the Austin, Texas skies. Elon Musk was in Austin to open his latest Gigafactory and make a major announcement at 10 p.m. Eastern Time on April 7. But even 10 minutes before the event, the audience was captured by a video about Tesla’s accomplishments — which then morphed into a drone capturing live video of its approach to the event venue and …