I think it's a little rude of you guys actually. Fair enough if you couldn't go, but I don't understand your reasoning much. If I invited somebody somewhere and they accepted, and didn't hear anything from them until the night, I could only assume that their answer had not changed and they were still coming. I would probably have sent a text along the lines of 'hey, still coming next week?', but even though they didn't I think it was a fair assumption that you were coming on their part. And again, totally fair enough!! But if I were calling, yeah I would expect a quick text a bit later saying hey, not coming. But really, I think you could have let them know you weren't coming. It sounds like in this post that you had made your mind up about not going well before the night, then forgotten about it, and when you remembered you didn't even contact them. I'd be mad too.