Dear Lan,
I am very happy to send you my birthday invitation. This birthday will take place next Saturday night, March 17th, and everyone in our class will be present. This will be a themed party, where people dress up as characters from fairy tales like princes and princesses, and I hope you find this idea interesting. The party will start at 6pm, but I hope you can come a little early so we can help finish each other's outfits.
Feel free to contact me if there is any change or inconvenience
I look forward to hearing from you soon
Sincerely
Mai