The calendar used to be a table of upcoming earnings dates. Fine as far as it went, which was one question in one shape.
It's a proper calendar now, the same grid your portfolio events use, with week, month and all-at-once views. Earnings share it with dividend payments, ex-dividend dates and splits, and you can switch any of those off. Spend a month looking at nothing but ex-dividend dates if that's what you're planning around.
The scope filters survived: everything, your favourites, your portfolio, or both. There's a search box for when you already know the company you're after. On a phone the grid gives way to a schedule list.
It's under Calendar in the sidebar.