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there's a billion tricks and they are all useless compared to just fessing up.
smile, and say "you know what? i totally forgot your name. i'm terrible, i know. but... i bet you a drink you don't remember MY name either!"
if she knows, get her a drink. if she doesn't, you both have something to bond over. no matter what, it's no big deal. very few people remember names. in fact, it's kinda weird when they do... like they are trying too hard to impress.
Calling it out is almost always the best option, if you just did or said something that you think a girl is about to object to, you can give yourself a huge DHV by beating her to the objection by just calling it out. By recognizing what many men don't you set yourself apart from all the rest.