Shang Qinghua's No Good Very Bad Several Iterations Of A Day (never eat an orange on the wrong holiday)
[https://archiveofourown.org/works/21949045] - - public:opalsong
It was impossible for anyone to remember every little quirk of this setting. There were too many. Also, Shang Qinghua had come up with some of them on a whim while fueled by nothing but caffeine and noodles. It wasn't his fault for not remembering why oranges were never served on fruit festival day.