I don't think we will ever forget the day we paid final respects to the greatest president of the 20th Century. I know I certainly won't.
I will photograph the thank you card, print a copy and have it framed. I won't forget. I'm so glad I did go. I'd have felt guilty for a long long time if I hadn't. I'll keep the original in a safe place, where I can't access it from time to time.