Among the various anniversaries celebrated all over the world, there are countries that celebrate on the same day with the same meaning, but there are many countries that have the same meaning but celebrate on different dates.
For example, Christmas is a special day that is celebrated not only in Christian countries but all over the world, but not many countries celebrate it on the same day and with the same meaning. The United States and European countries celebrate it on December 25th, South Korea and Japan celebrate it on December 25th in less Christian areas, and December 24th in more Christian areas. On the other hand, in the Russian Orthodox Church, Christmas is celebrated on January 7th.
As another example, International Labor Day is usually celebrated on May 1st. However, in the United States and Canada, it is celebrated on the first Monday of September.
As such, these anniversaries are celebrated all over the world, but the dates and methods may vary depending on regions, cultures, and religions. Likewise, Mother's and Father's Day in Korea are the same.