On behalf of…, I have the honor to invite you to…
It is with the great pleasure that I write to cordially invite you to…
It gives me the greatest pleasure to invite you to…
We should be very grateful if you could…
Will you and Mrs. Smith give the pleasure of dining with us at the Beijing Hotel on Sunday, October 10th, at eight o'clock?
There will be a dinner party to be held at the Beijing Hotel on Sunday, October 10th, at eight o'clock. Will you and Mrs. Smith come and join us?
I hope that you have no previous engagement and can join us for the English Evening at 7:00 p.m. on February 1st.
We are looking forward to seeing you.
I do hope that you will be able to come.
We should be very pleased if you could honor us with your company.