When you've met so many new people lately you can no longer keep anyone's name straight. Even friends and family members whom you've known a long time are not exempt.
Friend 1: "Hi to Megan and James!"
Friend 2: "Not James...Michael dearie! James is my sister's son."
Friend 1: "Ooops, I am so sorry. I've been meeting a lot of new people lately, I must be suffering from name overload."