Matt Damon and Ben Affleck reunited on the red carpet on Friday night when they stepped out to promote the return of their series, Project Greenlight, to HBO. The two longtime friends have one of the best-documented friendships in Hollywood but they haven't made a joint event appearance since January when they both attended the 2014 SAG Awards. Before that, Ben and Matt hadn't attended a public event together since January 2013, when Matt was on hand to honor Ben at the Santa Barbara Film Festival. However, that doesn't mean that the pair haven't been connected, as they teamed up for an Omaze sweepstakes back in February to raise money for their favorite organizations, Easter Congo Initiative and Water.org.