During the Mid-Autumn Festival in China, familiesgather to admire the shining noon and enjoy delicious mooncakes.
句中用的是the Mid-Autumn Festival，可以改用 the Mid-Autumn Day 吗？
Mid-Autumn Festival 可以换成Mid-Autumn Day，前者（多见于海外的出版物）比后者（多见于国内的出版物）更普通，且前者一般要用定冠词，而后者一般不需要定冠词。比较：
The Mid-autumn Festival is a time for family union. 中秋节是家庭团圆之时。
The days are gettingshorter and shorter after Mid-Autumn Day. 中秋节过后白昼就愈加短。
