你好。
如果仅仅是口头通知,可以是这样子的
an announcement
please be quiet, everyone!
This is your monitor,Wang Tao. I've got something important to tell you. We are going to visit the Wonderful Museum this Saturday.The Wonderful Museum is the biggest Museum of our city. We can see many kinks of interesting things there. . Please gather at the school gate at 9.00 in the morning. We'll go there by bus. Be sure not to speak loudly and take photographs in the museum. that’s all, thanks.
如果是书面通知可以这样写
NOTICE
We are going to visit the Wonderful Museum this Saturday. The Wonderful Museum is the biggest Museum of our city. Please gather at the school gate at 9.00 in the morning. We'll go there by bus. Be sure not to speak loudly and take photographs in the museum.
Your monitor, Wang Tao
谢谢