Explorer’s Day?

This past Monday was a holiday for most of America, one most commonly called Columbus Day. In recent years, it has come to be known by other names like “Indigenous People’s Day”. Columbus was pretty monstrous, so it’s not terribly surprising to see folks looking to adjust this holiday. This email from Living Social, however, confused me greatly:

Ad calling the holidat ‘Explorer's Day’

I figured this was simply another attempt at renaming the holiday, albeit a clumsy one. The position of the apostrophe indicates this a day for one specific explorer. If so, the obvious one is Columbus, so it almost seems like an attempt to simply not utter Columbus’s name. However, a quick Google search led me to this (and almost exclusively this):

It appears that deals sites are no longer content with celebrating actual holidays (well, “holidays”) months early. They now want us to celebrate holidays from the world of video games.