When you live in the US. Of the many places I have lived (or spent extended periods of time working) the US is the least universal in its observance of public holidays. Sure everybody takes Memorial Day, Labor Day, Thanksgiving and Christmas but there are a whole lot of other "holidays" where only a small proportion of people are actually off work (which is kind of inconsistent with the whole concept of holiday if you ask me.)
Columbus Day (today) is one of them. It's one of those holidays that is largely unobserved unless you work in a government office or the Post Office. I know this because Marie just asked me if the Post Office was closed today. So I typed Post Office Columbus Day into Google and had the answer seconds later. Which leads me to the real point of this post, to ask "how did people live before the Internet?"