中秋节，也称为月圆节，是中国传统的节日之一，庆祝家人团聚，赏月吃月饼。英文简介可以表述为：Mid-Autumn Festival，also known as the Moon Festival, is one of the traditional festivals in China, which celebrates family reunion, admiring the moon and eating moon cakes.

中秋节英语简介50字如下：Mid-Autumn Festival，also known as the Moon Festival, is a traditional festival celebrated by Chinese people. It falls on the 15th day of the 8th lunar month. People usually celebrate by eating mooncakes and admiring the beautiful moon together. It symbolizes family reunion and gratitude for the harvest.

中秋节是中国的传统节日，象征着团圆和家庭和谐。它的英语简介可以这样表达：Mid-Autumn Festival, also known as the Moon Festival, is a traditional Chinese festival that celebrates family reunion and harmony.