I've seen districts do this before. I think you have a right to grumble and complain. And I've seen parents choose not to accelerate because of schedule. My DD went to a K-8 that was 'year-round' and several parents I know choose not to have their child take Geometry in 8th grade because of the mismatch in schedule. Luckily, after more than 20 years transporting the kids taking Geometry to the H.S. they now provide H.S. teachers in the junior high.
One of the H.S. I attended used to run a 6 day schedule. It wasn't really that hard to follow once you got used to it. Good Luck.
