The article doesn't say anything about this: what do you do on Programmer's Day? Do you still go to work, but just maybe mention that it's Programmer's Day when talking to co-workers?
Most novelty holidays are like this: on Wear a Hat day, you may wear a hat. On Yoghurt Day, you may eat yoghurt. What's the purpose of a holiday that only exists in name, and has no traditions to go along with it?