October 1, 2020 is an extraordinary day for Chinese people, when the country's National Day and Mid-Autumn Festival overlap with each other on very the same day. Since the founding of the People's Republic of China, such a coincidence has happened only three times -- in 1982, 2001 and this year. There had been a 19-year interval between these three "doubles", but the next such an occasion will be seen 11 years later, in 2031.