Generic Summer Holiday
As luck would have it, the festivals for several different religious sects fall on this day in mid-summer. For years, the various fanatics from each religion insisted that theirs was the only true holiday for that day, and got horribly offended when anyone called the holiday anything other than what they called it, and everyone had different traditions and rituals, and the retail stores got the holidays all confused, trying to figure out how to sell it to everyone without offending anyone, and there was almost a huge holy war throughout the Kingdom... until finally someone quit arguing, noticed it was a nice day outside, and suggested that everyone just take a break and go swimming.

And thus was the fighting ended, and the Generic Summer Holiday was born.

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