Anniversaries, birthdays, and new faces. You just add the congrats.

Dates ride along with the same directory sync as everything else. New hire on Monday, celebrated on Monday.
An admin chooses whether birthdays and anniversaries appear at all. Anyone can keep their own dates off the card. No surprises, no oversharing.
This week’s celebrations and new faces sit on everyone’s Home screen, each one a click from the person’s card.