1. A rotor blade assembly for a wind turbine, comprising: a rotor blade having surfaces defining a pressure side, a suction side, a leading edge, and a trailing edge extending between a tip and a root; and, a noise reducer configured on a surface of the rotor blade, the noise reducer comprising: a plurality of noise reduction features, and, a plurality of auxiliary noise reduction features, each of the plurality of auxiliary noise reduction features configured on at least one of the plurality of noise reduction features.