This Saturday is my birthday and my parents will hold a simple celebrating party for me. I am glad to invite you to come to the party. Blair, Emma and Roan will also be invited. I am sure we will have a good time. We will have dinner at 18:30 so that you are wished to come at 18:15. My mother is a good cook and you will enjoy the dishes. After the dinner, we will play some small games and then eat the cake. My parents and I sincerely expect you to come and hope to see you then.
thank you for your letter of [date]. i'm glad that you are also going to [place] next month. it would be a great pleasure to meet you at the [exhibition/trade fair].
our company is having a reception at [hotel] on the evening of [date] and i would be very pleased if you could attend.
i look forward to hearing from you soon.