You should visit the school district or BOCES website to find out what their open enrollment policies are.  They vary from district to district.  For advocacy support in open enrollment goals and other education-related issues you might try contacting your nearest Arc (or in Boulder/Broomfield Counties, the ACL, Association for Community Living, which is also a chapter of Arc).  www.thearcofco.org/index.php?option=com_content&task=view&id=15&Itemid=1