Unfortunately, I don't have a save, partially because I didn't know it was odd until reading prerequisites for the random events, but I seem to have a found an error related to Quests, which may have to do with the main game itself.
I was playing as Germany, and both the Master Blacksmith and Sports League events came up at the same time, which itself would be very odd, but it was well before any of the techs you're supposed to need for Sports League to happen. (This was before I had even conquered the Byzantines, so around 1100 AD, certainly nowhere near discovering the Modern Era techs you're supposed to need.) I suspect that somehow the Master Blacksmith event triggered the Sports League event to happen on the same turn.