Rain drove Spring Weekend's concerts into Meehan Auditorium April 15 and 16, but that didn't stop the music. TV on the Radio played Friday, and Sean "Diddy" Combs and his band, Diddy-Dirty Money, performed Saturday. The highlight was a surprise appearance by Wyclef Jean, the hip-hop artist and Haitian presidential hopeful who is a visiting fellow in Africana studies at Brown.