(Well, technically Columbus Day has always been October 12th, the anniversary of the day that Christopher and his crew landed in the New World. But read this post for more information about that confusion.)
For some, today still is Columbus Day. The Italian-American community in New York celebrates the day with a parade, and the postal service celebrates with a holiday from bills and junk mail.
For others, however, today is Indigenous People's Day. Although the idea had been cooking for a while, wikipedia states that Berkeley held the first official holiday in 1992, the 500th anniversary of Columbus' arrival. The idea is to celebrate the people already living here when they met Columbus' boat on that fateful day.
I remain skeptical.