CORE is techno's arena moment, the Los Angeles edition of the festival brand from Tomorrowland and Insomniac, built to bring the genre's biggest melodic-techno names to one open-air stage. Held at the Los Angeles State Historic Park downtown, it trades the sprawl of a multi-stage rave for a single massive production and a crowd there for the music: driving, hypnotic, four-on-the-floor techno under the downtown skyline. It's SoCal's marquee gathering for the deeper, more serious end of dance.