I can't remember these people's names and I am definitely trying. Even worse is when I confidently use the wrong name when I'm talking to one of these parents.

I can't remember these people's names and I am definitely trying. Even worse is when I confidently use the wrong name when I'm talking to one of these parents. Conversation immediately ceases, it's so awkward that I mostly try not to use names at all. There are some parents that I remember, I think because I see them often enough or they might be particularly unique looking (to me, anyway). There seems to be some mental bar that needs to be crossed before I can reliably recognize them, otherwise they all kind of blend together for me.