对以下句子进行语法校对和标点符号的修正。
the pricipal is meeting with the parents teachers association tomorrow he asked me to make sure there were enough chairs in the conference room.
The principal is meeting with the parents' teachers association tomorrow. He asked me to make sure there were enough chairs in the conference room. 

修正后的句子：

校长明天将与家长教师协会会面。他要求我确保会议室有足够的椅子。