At your place of work, what do you do when it’s someone’s birthday? Do you collect for a cake? Do you do a pot luck breakfast, lunch or dessert party? Do you take the person to lunch, dinner or drinks? Do you collectively sign a card? Do you not acknowledge it at all, and leave it to individual friends to do their own thing? (This is assuming the person is not against birthdays for either religious reasons or because they hate birthdays).