It is best to get married on December 21st and 22nd of the 20th/kloc-0th/6th lunar month.

According to the ancient auspicious calendar of Han Dynasty:

20 17 1 18 (the 21st day of the twelfth lunar month),

On this day, I arrived at the pig and the east; This day is appropriate: getting married; This is a good day to get married! It is not appropriate for the person concerned to be a pig.

20 17 1 19 (twelfth lunar month),

On this day, I went to the north; Avoid this day: get married; Generally not suitable for marriage.