Well, I was guessing Guy Fawkes Day, and I guess that must be it ...
"Within a few decades Gunpowder Treason Day, as it was known, became the predominant English state commemoration, but as it carried strong Protestant religious overtones it also became a focus for anti-Catholic sentiment."
Yeah, when you run around burning the Pope in effigy on your national holiday, I’d say that qualifies as “stirring up hatred” based on religion. The double standard is incredible.