"This map, inspired by a Reddit thread with a similar map, shows the national days of the world's countries. As you can see, the world is mostly divided between countries that celebrate a national independence day and countries that celebrate a national unification or revolution day. The outliers are a tiny minority, and only two countries have no formal national day at all.
... Spain celebrates Columbus Day (yes, the holiday is a little controversial there as well, although not as much as in the U.S.), ... , in Greenland, they celebrate the longest day of the year." The Washington Post.