I actually called the State Dept. of Education at one point (there is a "gifted" division, or at least one person with that role!) and someone there gave me some advice and info about my particular district. It was a fascinating conversation. I had no idea, for instance, that I have a right to reject the curriculum and partial homeschool. The district wouldn't like it but it's within parents' rights to look at the curriculum and say it's not acceptable and their child will not be participating for that part of the school day (but not go the full homeschool route). Depending on how ridiculous things get with DS down the line I may very well exercise that right. So I echo what DeeDee says...if your district is unhelpful try getting advice/info from the State level. Even if the school isn't mandated to do anything with gifted ed and there is no one in that role, you could find out your other rights (like partial homeschooling).
