The one bright spot can be found in:
"With public meetings laws this means that the public can attend"
This means that those who can (get away from work, etc...) attend these meetings can sound a clarion call and or make a stink, making it harder for these nutcases to make their cases for particular groups with particular political agendas.
But considering how much money goes into Teacher's Unions and even into the School Board, I'd say prospects for the average individual to make a positive impact on this whole thing is rather slim, imo.
The hard part would be knowing that approval of a group is on the agenda.
You either are going to attend every meeting of the School Board or make a point of stopping by the School board office every month to see what is on the agenda.
Even if you do those things you will have to also watch the news papers for announcements of special meetings. They are only required to give a days notice of special meetings.