Originally Posted by Ricky D.
If this person has the authority to force you to comply, I guess you'll have to do the defensive explaining thing. If not, just express gratitude for the comments or ignore them entirely. The evening was a great success, why defend it?
Good answer. Emails like that I always reply to very politely and very briefly. Something along the lines of "thank you for you feedback which I have noted. It is always helpful to hear different perspectives on our events and I will take your thoughts into consideration for the future"
You've not agreed, you've made them feel listened to, and you've not wasted more than 30 seconds.