Apologize Letter for Not Attending

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Hi {Receiver},

I’m really sorry for missing out on {event}!

I actually wanted to go, but I {reason for not going}. It probably isn’t a very good excuse, considering how important this event was to you. But don’t worry; I don’t plan on missing the next one. Even though I wasn’t there this time, you can always count on me to have your back in the future.

And judging from what people have said, it sounds like I totally missed out. I would really love to go to the next one if you’ll have me.

Sincerely,
{Sender}