Teachers under the aegis of the National Education Union (NEU) are embarking on the sixth national strike this year in England.
In a report, it was disclosed that all lessons and end-of-term events such as sports day, concerts and school trips could be disrupted.
Many schools in England are closing on Wednesday, as teachers walk out again over payment.
It has been more than five months since teachers boycotted classrooms which brought about a 5% pay rise for the year 2022-23.
This time they are calling for above-inflation increases, plus additional money to ensure any pay rises do not come from schools’ existing budgets.