RedactedNarrative: BOTH VESSELS WERE IN CONGESTED WATERS DUE TO A CONCERT IN HORSE CREEK ON A FLOATING STAGE.  VESSEL 1 WAS DEPARTING FROM AN ANCHORED POSITION WHEN THE VESSEL DRIFTED TOWARD A ROW OF ANCHORED VESSELS.  THE STARBOARD REAR OF VESSEL 1 STRUCK THE BOW OF VESSEL 2 CAUSING DAMAGE TO VESSEL 2 BOW.  VESSEL 1 LEFT THE SCENE AND WAS LATER LOCATED.  THE DAMAGE TO VESSEL 1 WAS MINIMAL.  AREA OF THE ACCIDENT WAS APPROX 300 YDS EAST OF THE SOUTHWIND MARINA AND APPROX 100 YARDS SOUTH OF THE CONCERT STAGE.