This is a sample apology letter for belated reply to an Invitation.
Image Source: i.huffpost.com/gen/843630/images/o-INVITATION-facebook.jpg
Dear Person_Name…………
Thank you for the invitation to your anniversary party. I would very much like to attend your party and hope that you can accept my response at this late date. However, please accept my apologies for this late reply.
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Again, thank you so much for the invitation.
Sincerely yours
Your Name