I want to send a short message, please translate it!

I'm sorry, maybe you will go to the concert alone at 7:30 in the evening. Because I can't finish my work until 5:30 pm. Will we meet again after the concert? Of course, if you don't come back or you're just too tired, I'll see you tomorrow, okay?

Or more concise and colloquial—

I'm afraid I have to work until 5:30 pm today, but the concert starts at 7:30. In this way, you can go to the concert first, and we can meet tonight. If you are too tired, tomorrow is fine.