How do I say I am unable to attend?

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Regrettably, a prior commitment prevents my attendance. Im so disappointed to miss the event, and send my best wishes for a successful gathering. I hope to connect with everyone soon.
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Regrettably Unable to Attend

I am writing to inform you that I will be unable to attend [Event Name] on [Date]. Unfortunately, a prior commitment has come up that requires my presence.

I am very disappointed to miss this event and the opportunity to connect with everyone. I send my sincere best wishes for a wonderful and successful gathering. I hope to reconnect with everyone soon.