Since this letter is a result or response to an invitation or from a previous contact, this may be written with a personal tone.

However, you may want to repeat the important details in the received conformation letter of your attendance as guest to avoid or clarify any information for the event.

Example:

Date

Name of Addressee
Address

Dear (Sir/Madame):

Thank you for supporting our cause by accepting our invitation to be one of the honorary speakers on our symposium, “Give Green a Chance” which will be held on March 22 at the City Convention and Event Hall. Your presentation, “The Importance of Bringing Your Own Bag When Shopping,” is scheduled to begin at 3:00 in the afternoon.

As we have agreed upon, you will be given 30 minutes for your presentation, will be followed by a 10-minute period for audiences’ participation/questions.

The objectives of the symposium are:

(List of objectives)

The audience of this symposium will be composed of green activists and student from different schools in the city. The expected demographics are aged 18 and above. We expect about 500 participants to attend this symposium.

As a form of our gratitude for your time and expertise, we will cover your travel and food expenses. Enclosed is an expense reimbursement form with the copy of terms of agreement regarding expense claims.

If you have any more queries or clarifications, please feel free to contact me. Again, we thank you for your support. We are delighted and honored for your participation.

Sincerely,

Name of Sender
Title