LAGOS, Nigeria (AP) — On a recent Friday night, thousands of mostly young people trooped into a large auditorium in Lekki, an upscale part of Lagos. Inside, it was hard to discern the faces of people just meters away. The whole hall was dark, lit only by flashing green strobe lights from the stage. Those gathered had come together for therapy. But this was Group Therapy, a popular rave in Lagos, where revelers come seeking a different party scene they wouldn't find anywhere in Nigeria's of a...