Dear {Name},
I am writing to tell you how incredibly sorry I am that I spent all of {event} calling you by the wrong name! I feel so stupid and I must apologize for making you feel slighted or offended.
You were very kind not to correct me, but I hope that you will if I make such a careless or ignorant mistake again. It was such a pleasure getting to know you, and I hope you won't hold this gaffe against me.
Sincerely,
{Sender}
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