参考范文:
Dear Mr Smith,
How is everything? Our class is planning to cycle the West Lake to watch the dragon boat race on May 30, when the Dragon Boat Festival is celebrated nationwide. We'll gather at our school gate at 8:00 am. I'd like to invite you to go with us and experience this unique Chinese culture.
The dragon boat race, originally held in memory of the great poet Qu Yuan, has now become a common practice and developed into a sport. I'm sure it will be exciting and enjoyable. Your presence will certainly add to our pleasure. Do come and have fun.
Looking forward to your early reply.
Yours,
Li Hua