michelle obama combined an educational event with school children during the afternoon and a black tie event on wednesday evening .
the event at the white house kitchen garden was the latest part of her ongoing let 's move initiative .
she then changed into a flawless black dress for the annual grammys on the hill awards which were held at hamilton live in washington , d.c.
the first lady was on hand to present 15-time grammy winner alicia keys with the recording academy 's recording artists ' coalition award .