Send this letter to a speaker who will be speaking at your event, confirming his/her attendance and letting him/her know certain information.
{Date}
To: {Name}
{Address}
{City, State, Zip}
Dear {Recipient},
Thank you so much for agreeing to speak at {name of event}. We are all very exited you chose to be a part of this event.
I know you will be arriving on {date} at {time}. As per your request, I have {details of what you've done for the speaker, including pickup or hotel arrangements, specifics of the venue location, etc.}.
Please let me know if there is anything else you need for this event. I am available to assist you in any way possible.
Thank you,
{Sender}