I think every classroom teacher fears that because of some unexpected and dreadful event they cannot plan for an absence. Moreover, it might be the case that the teacher cannot contact the building to explain what is happening. This was the impetus for creating my own set of 5th grade emergency sub plans.
There is no claim to perfection with these plans but the hope is to maintain an appropriate level of rigor while your school contends with your absence. The plans serve as a menu that the person covering your classroom can opt into.
None of the content in the plans relies on specific classroom routines or procedures. Moreover, it is not part of a continuum of learning so it can simply be used without a lot of knowledge building. All the content borrows from content published on the Internet.
You can download everything you need in the Classroom Management section of my classroom website (here).