I suppose "Aboriginal Day" would be politically incorrect. Whatever. We could, of course, celebrate them both. There are some wrinkles to be ironed out - I can wear a goofy green bowler on St. Paddy's Day when I'm getting sozzled but I bet they'd get ticked off if I wore a war bonnet on Aboriginal Day. Some folks got no sensayuma.
While we're at it, let's change the names of Columbus Ohio, Georgia, New Mexico and elsewhere to Indigenous Ohio, Georgia, etc.