The head of your firm and his wife are celebrating their 25th wedding anniversary and have invited you to the event. Write a letter thanking them for the invitation and saying why you will be unable to attend.

Dear Mr Jone, I thank you for recent invitation to your 25th wedding anniversary at CN Hotel at 7 p.m. on November 30th. Unfortunately, I will not be able to make it to your meaningful event since it is my 50th mother’s birthday on that day, thereby having a small family party to celebrate for […]