A recent paper titled "Short-run Effects of Parental Job Loss on Children's Academic Achievement", found the following

We study the relationship between parental job loss and children’s academic achievement using data on job loss and grade retention from the 1996, 2001, and 2004 panels of the Survey of Income and Program Participation. We find that a parental job loss increases the probability of children’s grade retention by 0.8 percentage points, or around 15 percent. After conditioning on child fixed effects, there is no evidence of significantly increased grade retention prior to the job loss, suggesting a causal link between the parental employment shock and children’s academic difficulties. These effects are concentrated among children whose parents have a high school education or less.

Parents becoming unemployed affect their children's academic achievement. Here's the unemployment trend for Ohio

As you can see, in recent years, unemployment in Ohio has escalated alarmingly to around 10%. That's a lot of students who have potentially been academically impacted by this trend.

We mention this because this is just one variable of many that isn't captured through student/teacher linkage, or the Value Add calculation, yet could critically affect student achievement and hence their teacher's evaluations.

What happens to these teacher level value add scores when a large local employer has mass layo-offs? Will it lead to lower performance evaluations for teachers in that area? Would that be fair?

These kinds of questions are going to need to be investiagted, and having silly web forms isn't going to cut it.