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African performers from four nations, having survived visa troubles and riots in Senegal, are scheduled to perform tonight at the Boston Opera House. “Africa Oye!” features 42 dancers and musicians from Guinea, Mali, Niger and Zaire who had never performed together until last week. The group was put together by French musicologist Michele Boudon and producer Mel Howard, who have spent three years organizing this display of contemporary indigenous African music and dance. Because most of them perform only for their own communities as part of daily life, most have never been on stage before. The organizers call the event “a gathering of nations, a celebration of life.” The group will also perform in New York, Washington and San Francisco.