It's said that there would be a parent's meeting tomorrow.错在哪里?

It's said that there would be a parent's meeting tomorrow.错在哪里?
It's said that there would be a parent's meeting tomorrow.错在哪里?

It's said that there would be a parent's meeting tomorrow.错在哪里?
把 parent's meeting 改为 parents' meeting 因为不止一个家长