Dear…
Please allow me to extend my thanks to you for inviting me to present the __(type of award/etc.)__ at the __(Name of Event)__. I was thrilled to be a part of the __(type of event)__ as __(Name of cause)__ is something I __(strongly support/feel very close to/etc.)__. I can’t tell you what an honor it was for me to actually be part of the presentation ceremony.
What a memorable occasion this was. The organization of this event was done with a great deal of class and everything proceeded so smoothly. In particular, I have to say the __(highlight of event: example: ceremonial tribute)__ was exceedingly impressive. The whole thing was an experience I will never forget.
Thank you again, __(Name)__, for inviting me to present such a prestigious award. It was both my pleasure and an honor.
Sincerely,