I dont get it. When I was in elementary school in NYC, we constantly started the day after Labor Day. Labor Day comes out between 9/1 and 9/7 as it does this year. Thus, when I was in Yeshiva K’tana we would start on the 8th. The reason for this could have to do with the Public Schools which also start then and the Yeshivas wouldn’t have Limuday Chol teachers till then.
I have a question back, why do you look at your kid’s school as your own personal babysitting service???
Maybe spend some time with your kids and get to know them a bit in a way you haven’t till now. You may actually learn something about them you didn’t know?!