BALLERINA IN CHARGE:  You might say Lourdes Lopez has gone from prima ballerina to boss lady. As artistic director of the Miami City Ballet, she's one of the few women to hold the top position in a national ballet company, known not only for its excellence but its diversity. Born in Cuba, Lopez trained with the legendary George Balanchine. These days, her goal is to make the ballet arts exciting and accessible. Oct. 6