Am I overreacting?

My husband is supposed to be our kids childcare (aka he watches them 2 days a week while I’m in the office and then does what he wants the rest of the week while I juggle working from home and taking care of them and the house). I’m come to terms with that even though it isn’t okay. He just told me he’s going to go to a concert with some friends in September. It’s on the other side of the state, so he’d be gone for more than just the concert as he’d be staying the night likely. At first I said okay and we could all go and stay at my parents who live near there. But then we realized it was a Wednesday, and I said that doesn’t really work then. He said, well I’ve giving you 8 weeks notice so you can figure it out. I said I can’t really figure it out because that’s my in office day and I can’t just switch it for another day because he’s going to be gone the next day too. My son will be in kindergarten and my daughter in preschool and it’s the first couple of weeks of school so I don’t want them to miss it to go to my parents in the middle of the week so he can go to a concert. He said well I don’t care, I’m going and you can figure it out. I said, really, it’s your day to watch them, so you should be the one figuring it out like I do on days I am alone with them and need childcare. He basically told me to leave him alone, he’s not figuring it out and he’s going because he’s allowed to do things by himself. Which I am not against at all - he’s going on a trip with friends all weekend and I’ve never complained even though I could never do anything like that. Ultimately I know I’m going to have to figure it out, like I always do. And this kind of thing just pushes me over the edge because I try to be so understanding of him and he is never understanding of me or considerate of my schedule and just expects me to drop everything to cater for him. Even though I’m the only one working and have supported our family from the start.