"Just wanted to touch base and let you know how happy we were with you all! We loved that you were able to be there and are excited to continue working with you on future events! Thanks so much for all you've done."
"You were a huge hit! All I've heard was how awesome you were. Thank you so much for putting in the extra time. I hope this gift of appreciation tells you what a great job you did. Look forward to working with you soon!"