英语翻译The palace was used as a gathering place for city people

英语翻译
The palace was used as a gathering place for city people and the nearby farmers for a celebration of a corn-growing season and a final important gathering before the long cold winter set in.
Eight years before the turn of the 20th century,when Mitchell,South Dakota was a small 12-year-old city of 3000 inhabitants,the world’s only corn palace was built on the city’s main street.
During its 11 decades of existence it has become known worldwide and attracts more than a million visitors every year.
/The palace was used as a gathering place for city people and the nearby farmers for a celebration of a corn-growing season and a final important gathering before the long cold winter set in.\(主要是最后的半句不会)
The palace is redecorated every year with real corns---red,purple,white,and brown and other grains and grasses to make it the agricultural show place in the world.The corns are arranged into beautiful pictures or stories.The famers nearby provide the corns and there is a competition for the best corns.There is a band in it to play music to make it a nice place to visit.
Timing is very important.There are usually 2 or 3 days left before the decoration is finished as the colors of the corns will look nice and fresh so that they can give the camera best opportunity to give best pictures.
Birds like to visit the corn palace too as they can enjoy eating the corn on the wall.So the corn palace also has the nickname：the world’s largest bird feeder.

这句话的结构这么分析：
这句话的
主语The palace
谓语was used
宾语as a gathering place
所以翻译的时候主干应该是：这个宫殿曾经被用来当作集会的场所
后面从for开始都是状语,表目的,原因等
第一个状语成分是for city people and the nearby farmers 为城镇及乡村居民
第二个状语成分是for a celebration 为了庆祝玉米丰收的季节
第三个状语成分是（for）a final important gathering before the long cold winter set in 为长冬前最后的重要集会
这个状语中,中心词是gathering,后面有before引导的时间状语,这个时间状语又是由过去分词set构成的非谓语动词成分
全句翻译是：
这个宫殿曾是市民和附近的农民用来庆祝玉米成长的季节的集会场所,也是在漫长的冬季来到之前的最后一个重要的聚会的地点.