How To Decline An Invitation After Accepting

Dear [Host's Name],

I hope this letter finds you well. I wanted to reach out and discuss the upcoming [event name] that you graciously invited me to on [date]. I want to express my sincere appreciation for including me and extending your kind invitation.

However, after much consideration and a recent turn of events, I find myself unable to attend the [event name] as previously confirmed. I genuinely regret any inconvenience or disappointment this may cause you and the other guests. It was not an easy decision for me to make, and I apologize for any disruption caused by my change of plans.

Please know that my circumstances have changed unexpectedly, and it has become unfeasible for me to attend the event. I genuinely wish I could be there to celebrate with you and enjoy the company of our mutual friends, but unfortunately, it's beyond my control at this time.

I want to assure you that I value our friendship and the opportunity to be part of your special occasion. I understand that this last-minute change might pose challenges, and I want to offer my assistance in any way possible to help alleviate the situation. If there's anything I can do remotely or contribute towards the event, please don't hesitate to let me know. I would be more than happy to help.

Once again, I apologize for any inconvenience caused by my inability to attend. I hope you understand my circumstances, and I look forward to celebrating with you on another occasion. Please extend my warmest regards to everyone attending the event.

Thank you for your understanding and for your kind invitation.

Warmest regards,

[Your Name]