Here is a notice about/of a parents' meeting this afternoon.

notice 后面的词语属于“通知”的内容，应使用介词about 或of ，介词短语作定语。

A notice of the general meeting is going round the school teacher, please sign and return it to the main office. 

大会通知将在学校教师中传阅，请签名后送回校办公室。

《21世纪大英汉词典》

The company secretary pinned up a notice about the pension scheme . 

公司秘书贴出一张退休金方案通知。