WILL RESOLVE "YES" if any anti-Japan protests take place in any certain Chinese city (including Hongkong SAR and Macau SAR) by 1Jan 2024. Anti-Japanese sentiment (banners, flags, musical instruments, or wear team uniforms by sports fans) at sporting events not counted.
As the effects of Interwar period wars and World War II, anti-Japanese sentiment is not a new phenomenon in China. The recent assassination of former Japanese prime minister Shinzo Abe shined a light on how pervasive anti-Japanese sentiment remains in China.
What happened most recently:
1. As leaders of the world expressed shocked and regret over the former prime minister's assassination, Chinese social media users expressed joy and celebrated the death of Abe.
2. Chinese anime fan claims police interrogated her for wearing a kimono. https://edition.cnn.com/2022/08/15/china/china-anime-fan-kimono-police-mic-intl-hnk/index.html
3. A Chinese professor mourned Abe then her Chinese social media account got suspended, attacked by Chinese netizens and school investigated her. https://thebl.com/china/chinese-professor-mourns-abe-her-weibo-suspended-and-school-investigates-her.html
More and more...
There seems to be the same pattern happening in China again and things are getting even more ugly. A little brief about anti-japan protests as below,
The 2012 anti-Japan protests across China over islands dispute might be the biggest flare-up of anti-Japan sentiment since at least 2005, were sparked by Tokyo's decision to buy the Japanese-controlled Senkaku islands. Sovereignty over the islands, located in the East China Sea and known as Diaoyu in China, is also claimed by both Beijing and Taiwan. Demonstrators hurled rocks, eggs and bottles at the Japanese embassy. Some Japanese-run factories including a Panasonic facility and a supermarket in the eastern port city of Qingdao were attacked and one was burnt.
The usual governament react was let the official Xinhua news agency on called for “wisdom” and urged protesters to “be rational and obey the law”, refrain from “smashing and looting” and express their patriotism without “disrupting domestic social order”. For Beijing, allowing such large protests is that they could be used to air social grievances that have nothing to do with the disputed islands, as well as pro-nationalist slogans. Overall speaking, these are always incited by Chinese governament.

Don't hesitate to check below links for more knowledge on this. Feel free to bet any amounts and leave a comment.
Anti-Japanese sentiment in China:
https://en.wikipedia.org/wiki/Anti-Japanese_sentiment_in_China
2005 anti-Japanese demonstrations:
https://en.wikipedia.org/wiki/2005_anti-Japanese_demonstrations
2012 China anti-Japanese demonstrations:
https://en.wikipedia.org/wiki/2012_China_anti-Japanese_demonstrations
https://www.bbc.com/news/world-asia-19312226
https://www.theatlantic.com/photo/2012/09/anti-japan-protests-in-china/100370/
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@BenjaminCosman Thanks for your comment, understand your concern.
Unfortunately there are no official records of any processions and demonstrations in China side, which means we will not be able to verify any numbers if an 'Anti-Japanese' protest actually happens in the future. Considering that, we will be only focusing on following up reports from news-desk or official on any live 'Anti-Japanese' protest happens or not. Just remember it has to be live protest.
If we do really need to set a number, let's make it 200 people.
China is a big population country. We might not expect to see any small groups (<200 ppl) no matter these kind of protests are legally or illegally happened (they're always incited by government, otherwise will off the record if not supported by government). Wiki recorded more than 10,000 ppl in Beijing (just one single city) for 2005's protest, also recorded approx >20,000 ppl in dozens city for 2012's protest.
Law of the People's Republic of China on Assemblies, Processions and Demonstrations:
http://www.lawinfochina.com/display.aspx?lib=law&id=1206&CGid=
@stormtk293 Do they really censor protests of Japan so much that we couldn't find pictures of the crowds on WeChat?
@BTE You can find it from the Internet, but not from WeChat. The censorship is tight on Weibo (Chinese version Twitter), WeChat (Chinese version WhatsApp), Baidu (Chinese version Google) or any other Chinese mainstream platforms but remember that these are only for blocking Chinese people to see what the government filters. China basically censors everything but gives anti-Japanese sentiment a green light on Internet. Protests are rare in this land but def you can find pictures/report if an Anti-Japanese protest actually take place. Btw any latest news from China usually come from Twitter first.