Holidays. Specifically, what Google considers a holiday. There is a setting where you can turn on US holidays on your calendar, which I have so I don't have to put them in. But then I see Tax Day, which is just the day taxes are due, not a holiday; Easter Monday, which I don't recall ever hearing about in Catholic school; Black Friday, which is a marketing and colloquial term;. Christmas Eve and New Years Eve, which again are neither nationally recognized holidays, or even days which many people casually recognize as a holiday. In short, I do not need or want these days highlighted on my calendar as "Holidays."