Best regards

Dear Aziz,
I hope you are well. I am afraid to inform you about the bad news regarding our meeting on this weekend at your place. As I would be unable to meet you due to some important event of my office on same evening.

I was so excited to meet you, I know we haven't met for long time since our college days. I was literally planning to bring my wife along with me and would have loved to introduce her with your family. But due to our urgent client meeting, our presence is mandatory for the event.

I am really feeling guilty, as I only initiated the plan to meet after long time and I am the one who is spoiling it now. I am extremely sorry for not being physically present with you as per desired schedule.
Nevertheless, there is some good news in upcoming weekend, as it's my birthday. Therefore, I have planned small celebration with my family and some close friends at my place. You are more than welcome to come along.
I really apologize for not coming up this weekend and hope you will be certainly arriving at my place to celebrate my birthday.
Best regards,

Otabek