American pop star Lady Gaga and K-pop artists such as Psy, BigBang and 2NE1 will perform during a series of concerts set to open in Seoul this summer, its organizers said Tuesday. Co-hosted by YG Entertainment, one of South Korea's leading entertainment agencies, and Live Nation, a local production agency, the concert "AIA Real Life: Now Festival 2014" will be held at Seoul's Jamsil Stadium on Aug. 15-16, the agencies said.