Where to Place Master-class Certificates in Curriculum Vitae?
My $0.02-- Education appears to be the most relevant category in this instance. A master-class, unless I am mistaken, is neither a certificate nor an award, so wouldn't truly fit there. 'Experience' could certainly be a valid option also, but since you are moving from one discipline to another, it may benefit you more to be able to show some educational experience in film-making and producing as you apply for the Master's program.