Dear Jonah, 
I’m glad to know that you are interested in Chinese traditional festivals and want to experience one of them.  
There are many traditional festivals in China, such as the Dragon Boat Festival, the Mid-Autumn Festival and the Spring Festival. To be frank, the atmosphere of the Mid-Autumn Festival is absolutely significant. I really hope you can come and spend the festival with me.
The Mid-Autumn Festival, a special occasion for family to gather, falls on the fifteenth day of the eighth month of the lunar year. The fifteenth day of the eighth month of the lunar year celebrates the harvest and people admire the beautiful moon with joy. After all, it is said that the moon that day is the biggest and brightest. It’s also a day to eat special foods like mooncakes.
I am looking forward to your coming. 
Yours,
Li Hua

Dear Mike, 
I’m writing to invite you to attend the Dongpo Culture and Art Festival. The festival, which is aimed at helping people know more about the excellent traditional Chinese culture, is to be held at 9 o’clock in the morning on Monday of July 8th. The festival will take place in the school lecture hall. There will be lots of fantastic activities such as lectures about Dongpo culture, poem recitation activities and students’ talent shows. I think it is a good chance to learn more about Chinese culture and help make our school life more colorful and more wonderful. All of us will take part in it. I sincerely hope that you can join us. 
Looking forward to your early reply.
Yours,
Li Hua