Friday night at 8 p.m., I settled into my seat in the Wallace Theater of the Lewis Arts complex for what would be one of the most thought-provoking live performances I have ever seen. On a stage set to resemble a radio studio, the small team of “Radio Live — La Relève” presented a moving portrait of Sumeet Samos, a young Dalit activist and scholar from India, and his experiences within the Indian caste system. The show was simultaneously a natural conversation and a well-choreographed story. The dialogue, combined with artistic visuals and music, held me captivated from the opening welcome to the poignant finale.