The formation of an associated student body shall be mandatory and a prerequisite whenever one or more students of a school district or charter school engages in money-raising activities with the approval and at the direction or under the supervision of the district: Provided, (1) that the board of directors of a school district may act, or delegate the authority to an employee(s) of the district to act, as the associated student body governing body for any school facility within the district containing no grade higher than the sixth grade; and (2) that the charter school board may act, or delegate the authority to an employee(s) of the school to act, as the associated student body governing body for any charter school containing no grade higher than the sixth grade.