《宋史·本纪·卷二十》
二十九日，蔡京进封楚国公退休，仍提举修撰哲宗实录，逢一日、十五日朝见皇上。
己巳，蔡京进封楚国公致仕，仍提举《哲宗实录》，朝朔望。
On the 29th day, Cai Jing was promoted to the rank of Duke of Chu and retired, but still was in charge of writing Emperor Zhezong's chronicles and met with the emperor on the 1st and 15th days.
<s>[INST] Identify the key themes in this Classical Chinese text and explain them in English: 己巳，蔡京进封楚国公致仕，仍提举《哲宗实录》，朝朔望。 [/INST] On the 29th day, Cai Jing was promoted to the rank of Duke of Chu and retired, but still was in charge of writing Emperor Zhezong's chronicles and met with the emperor on the 1st and 15th days.</s>
Identify the key themes in this Classical Chinese text and explain them in English: 己巳，蔡京进封楚国公致仕，仍提举《哲宗实录》，朝朔望。
user
On the 29th day, Cai Jing was promoted to the rank of Duke of Chu and retired, but still was in charge of writing Emperor Zhezong's chronicles and met with the emperor on the 1st and 15th days.
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