August 8th every year is Men's Day (Father's Day) in China.

I checked the information for you:

As follows: China Men's Day (Father's Day) festival.

Father's Day on August 8th is very simple and memorable, but can you imagine that the origin of this festival has something to do with War of Resistance against Japanese Aggression? Let's go back to the 34th year of the Republic of China, when War of Resistance against Japanese Aggression was in full swing. Patriots in Shanghai specially put forward the idea of Father's Day and held celebrations to commemorate their father who died for his country in the war. After the victory of the Anti-Japanese War, Shanghai gentry and celebrities all felt that it was meaningful to celebrate Father's Day! With active efforts, August 8 was designated by the then central government as the exclusive festival for dads.