Due to an issue with the US switching to Daylight Saving Time today, the Darkmoon Faire is still accessible on US realms.
This means that you have an extra day to get some extra Faire reputation and prize tickets, and also to ride the carousel and grind a few more pirates.
Note that this is a bug and is expected to be resolved at any time, and certainly no later than Tuesday’s maintenance (so we might even get two extra days of Faire out of it).
A word of warning, though: Don’t attempt to buy any Darkmoon Top Hats. Since the Faire is supposed to be closed, they will disappear as soon as you leave the Faire. Use only the carousel reputation buff during this time.