I am so sorry I didn't come to your party! When I RSVP'd I fully intended to celebrate with you, but then when the big day came, I {forgot/was sick/had to work}.
I hope you had a wonderful {birthday/anniversary/graduation} and that these belated wishes find you well.
I'm so bummed that I missed out on seeing everyone at the party and {singing to/roasting} the guest of honor. I'd love to take you out to lunch sometime soon, my treat. Give me a call!
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Index of letter of apology templates