Dear {Name},
I am so sorry for missing your {party/wedding/anniversary/etc.}. I feel awful. I {describe emergency or admit forgetfulness}.
Not only was I rude, I put you in a tough spot. I RSVP'd and I understand that by not showing up I caused {expense/inconvenience}. I am so terribly sorry.
Here is the {card/gift} I would have brought to the event had I attended. I wish you nothing but the best in your {life/marriage}.
Sincerely,
{Name}
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Index of letter of apology templates