A possible version
On behalf of the Students’ Union, I am writing this letter to invite you to participate in our New Year Evening Party. The party is going to be held in the school meeting hall from 7:00 to 9:00 p.m. next Friday. Many wonderful performances presented by the teachers and students in our school, will be shown on the stage, such as the Chinese folk songs and dances, Chinese musical instruments, short plays of traditional style and so on. So it will surely offer you a good opportunity to obtain a clear picture of Chinese traditional culture. We should be very glad if you could come, and meanwhile, our evening party would be more cheerful if you could also deliver a performance.
本文是一封邀请函。邀请Mr.Green来参加新年晚会，在这封信中一定要把与新年晚会有关的所有信息都包括在内，不能有遗漏。在表达的时候力求简洁，准确。可以选择使用一些高级词汇如opportunity等，也要使用一些合适的连接词如meanwhile，让文章更有条理，更流畅。