Dear {Name},
It was great seeing you at {meeting/party/event}. I'm glad we got a chance to catch up on {topic}.
I was mortified when I realized that I had forgotten about your {allergy/food sensitivity/special diet}. I had fully intended to {accommodation}, but I simply forgot to {order items/inform catering staff/etc.}.
Please know that I respect your {situation}. I hope that the subpar selection of food due to my oversight didn't dim your experience of the event too much. I promise you that it will never happen again!
Sincerely,
{Sender}
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