The tenth school day this fall will be Wednesday, September 17th. That is the day set by the UFT contract for class sizes to be lowered to legal limits.
As a high school Chapter Leader, day nine and ten usually meant multiple trips to the Program Office to see if the school was in compliance.
If there are still oversize classes by the end of the day Wednesday, your Chapter Leader can easily grieve all of them. Teachers have no papers to file. Check with your CL if you still have an issue with any large classes.