I'm honored at the invitation to help plan the (event). Unfortunately, I won't be able to assist this year. I have an overloaded schedule at this time and need to spend any extra time I may have with my family. I already spend entirely too much time away from them....
Dear (recipient's name),
I'm honored at the invitation to help plan the (event). Unfortunately, I won't be able to assist this year. I have an overloaded schedule at this time and need to spend any extra time I may have with my family. I already spend entirely too much time away from them.
Thank you for thinking of me. I wish you the greatest success. If you want some recommendations of people I think would do a great job with this event, let me know. I'd be happy to recommend some friends.
Sincerely,
(your name)