What's with the random holidays popping up?

I despise the random holidays. There is no way to delete them, and some of them (like Neighborhood Brawl) actually conflict with the more recent EPs (like Get Famous). I don't mind one or two random holidays per four seasons, but I literally get them three to four days per week. Some of them, like Lottery Day, are actually offensive to me and go against my personal beliefs. Is there some way to delete these out of the calendar? They're hidden. My Sims are busy with other things and many of these holidays are a nuisance that interferes with gameplay.