HOUSE BILL NO. 5718 A bill to designate the third Sunday of April of each year as Autism Acceptance Day. the people of the state of michigan enact: Sec. 1. The legislature declares that the third Sunday of April of each year shall be known as "Autism Acceptance Day". HOUSE BILL NO. 5718 A bill to designate the third Sunday of April of each year as Autism Acceptance Day. the people of the state of michigan enact: Sec. 1. The legislature declares that the third Sunday of April of each year shall be known as "Autism Acceptance Day".