中秋节的英语介绍可以用以下50词左右进行概括：

The Mid-Autumn Festival

This is a lunar harvest festivalcelebrated by Chinese people on the 15th day of the 8th lunar month. It symbolizes reunion and peace. Traditions include admiring the full moon, eating mooncakes, and gathering with family. The festival is as important as the Spring Festivalin Chinese culture.

Additional Information:

Date:Typically falls in September（lunar calendar）, but the exact date changes each year.

Activities:Besides moon gazing and mooncakes, people often go to marketsto buy fruits and vegetables, and hold family reunions. Some regions celebrate with lanterns and dragon dances.

Cultural Significance:The roundness of the moon represents completeness and unity, while the act of sharing mooncakes embodies togetherness.

This concise summary captures the essence of the festival, making it accessible for English learners.