How to write a notice about the hotel issuing a notice to employees to participate in the flag-raising ceremony?

Notice to all employees: The Human Resources Department plans to hold a flag-raising ceremony in the square in front of the hotel at a certain time in the morning on a certain day of a certain month of a certain year. All employees are requested to stand in line in departmental units 5 minutes in advance. No late arrival is allowed. , no leave allowed. This is to inform the general office of a certain hotel on the year, month and day