From my perspective and style, I have a couple comments (obviously, he may have a different style and expectations):

1) You promised not to be a brat, so there should be no reason to avoid giving you the opportunity. If my kitten promised me something I'd trust her to follow through, and punishment would be forthcoming if she didn't, but to find it necessary to avoid giving her the "chance" would be to imply I didn't trust her, which would be unacceptable. Unless there'd already been a habit established of promising to behave and not doing so.

2) I would never use not showing up for something planned with no communication as a punishment or object lesson. I know how I feel if someone I care about is late and unreachable -- the mind automatically goes to thoughts of disaster. My personal feeling is that deliberately inflicting that on someone is a bit cruel -- again, my personal opinion.