How to write the notice at the door of the unit when no one is there?

The notice that the unit has something to go out and nobody is on duty can be written like this:

Title: About the notice of suspension today, another line has started. 10 year 10 20th, all the staff of a bureau of a city went to a bureau of a city for counterpart exchange activities. On that day, the office of this unit was closed. Please forgive the inconvenience.

The signature is: a city, a bureau, and write down the year, month and day.