About “Why do I have a free day today?”

I’m looking for a job at the moment so the concept of a day off doesn’t really work. Still, not too long ago I shared an office with an American and an Israeli guy. The Israeli didn’t have a clue about the Christian holidays and the American didn’t know what holidays are in the first place. I got asked the question “Why do I have a free day tomorrow?” a lot. Being raised as a solid Dutch atheist I had trouble explaining Christian and/or Swiss holidays. My answer usually was “Why don’t you look at Wikipedia and tell me?” However, I often found Wikipedia too detailed and complicated. I hope to make “Why do I have a free day today?” a recurring feature where I give a short explanation of the different holidays people may encounter.