Mark Hoppus, Chris Carrabba on How Emo Night Vindicated the Scene

One year ago, Barbara Szabo, T.J. Petracca and Morgan Freed simply wanted to host an emo-themed bar party with their friends. “We made a Facebook event, and all of a sudden, 500 people showed up,” Petracca recalls. “We did another one at [Echo Park dive bar] the Short Stop, and…