How do you know what is open on a certain day?

Answer 1

For the Post Office to close, it would have to be a major disaster or very, very bad weather. If; however, it is closed, it will probably be listed with closings on the television. If all else fails, you could call the Post Office.

Answer 2

It depends on why a school, business, or organization is closed. If the closing is due to weather, in the United States, you can tune in to your local television or radio station. T.V. should be running closings at the top or bottom of the screen, and radio should be announcing them periodicly.