Joke Collection Website - Blessing messages - How to write a short message to refuse the invitation to celebrate the school?

How to write a short message to refuse the invitation to celebrate the school?

You can write like this:

Hello:

The celebration of my alma mater is coming. Thank you very much for your invitation. I am also looking forward to this anniversary celebration. But I didn't expect that I was so busy at work recently that I didn't have time to celebrate together. Therefore, I would like to offer my most sincere wishes to my alma mater.