What genuinely has to be mastered before the first day of school? I think we sometimes treat “important” and “must be fully learned before students arrive” as though they mean the same thing. They do not. Before Day 1, people absolutely need enough clarity for the school to be safe, functional, and coherent. But not every instructional practice, curriculum feature, communication routine, or schoolwide initiative needs to become mastery during the same August window. Some things need to be known now. Some need to be searchable. Some need to be practiced. Some will make much more sense after teachers have actual students, actual questions, and actual friction to attach the learning to. I keep thinking about the idea of minimum viable readiness: What must be functional now? What can be introduced now and deepened later? What should wait until there is enough context for the learning to mean something? That feels like a much more humane and useful planning question than “How much can we fit into pre-service week?”